Error codes

Plexus Mod Loader reports problems with PLEXUS-area-number codes. An error-level problem during a startup phase stops the run in that phase (Plexus Mod Loader launch stopped in phase …). For a problem in a callback during a run, Plexus Mod Loader either logs it and continues, or turns off just that feature, depending on the area.

Find the code in the log, then pick the area from the tables below. Log locations and reports are in Troubleshooting mod development; if you play with mods, see If something goes wrong.

Areas at a glance

Area	Meaning
PLEXUS-ENTRYPOINT	The entrypoint class could not be created or run
PLEXUS-CONTENT	Content ID errors, late declarations, creative tab, tag, and menu problems
PLEXUS-COMMAND	Command name conflicts, late registration
PLEXUS-NETWORK	Channel ID errors, sending before connecting, bad payloads
PLEXUS-CLIENT	Client API used on the server, HUD and drawing failures
PLEXUS-WORLDGEN	Unknown placed features, generator and biome ID errors
PLEXUS-RESOURCE, PLEXUS-PERMISSION	Reload directory and permission node errors, listener and provider failures, resource file problems found at build time (004 to 009)
PLEXUS-STORAGE, PLEXUS-BACKUP	Stored data from a newer version, backup check failures
PLEXUS-GAMETEST, PLEXUS-SCHEDULE	Test registration errors, scheduled task exceptions
PLEXUS-METADATA	plexus.mod.json (or poly.mod.json) problems
PLEXUS-DEPENDENCY	Problems in relations between mods
PLEXUS-SYSTEM	System replacement problems
PLEXUS-TRANSFORM	Code transform rule and cache problems
PLEXUS-COMPAT	Mods from other loaders that are not supported
PLEXUS-BOOTSTRAP, PLEXUS-DISCOVERY	Game jar, version adapter, game layer, jars with no metadata
PLEXUS-SHUTDOWN, PLEXUS-EVENT	Shutdown tasks, event listeners

Native API

Code	Meaning
PLEXUS-CONTENT-001	Invalid or duplicate content ID
PLEXUS-CONTENT-002	Declaration after registration closed
PLEXUS-CONTENT-003	Cannot add to the creative tab
PLEXUS-CONTENT-004	Unknown pack kind
PLEXUS-CONTENT-005	Cannot create the menu type or spawn placement rule in this game version
PLEXUS-CONTENT-006	The block shape function threw an exception or returned null
PLEXUS-CONTENT-007	An entry added to a tag with addToTag is not registered when the registries freeze (only that entry is left out, the rest of the tag loads)
PLEXUS-CONTENT-008	An entry or the icon of a mod creative tab is not a registered item when the registries freeze (only that one is left out; a missing icon falls back to the first entry, and a tab with no entries left is not registered)
PLEXUS-COMMAND-001	Two mods registered the same top-level command (warning, trees are merged)
PLEXUS-COMMAND-002	Registration after registration closed
PLEXUS-NETWORK-001	Channel ID error
PLEXUS-NETWORK-002	Sent before connecting, or declared after registration closed
PLEXUS-NETWORK-003	Size exceeded (32 KiB toward the server, 1 MiB toward the client)
PLEXUS-NETWORK-004	Decoding failed (the payload is dropped)
PLEXUS-NETWORK-005	Mod code in a join-preparation exchange threw an exception (a failed request is skipped, a failed reply sends no response, a failed check rejects), or an invalid wait time
PLEXUS-GAMETEST-001	Invalid test name or time
PLEXUS-GAMETEST-002	Registration after registration closed
PLEXUS-CLIENT-001	Client API used on the server
PLEXUS-CLIENT-002	Client ID error or registration closed
PLEXUS-CLIENT-003	HUD layer or drawing failed (only that layer is turned off)
PLEXUS-CLIENT-004	Failed to add a key binding
PLEXUS-CLIENT-005	A dynamic texture was uploaded from a thread other than the client thread, or particle or post-processing hookup failed
PLEXUS-CLIENT-006	Could not create or compile a mod shader pipeline (logged once, that quad is skipped)
PLEXUS-CLIENT-007	A mod shader uniform value threw an exception or has the wrong count, or the upload failed (logged once, the last valid value is used)
PLEXUS-CLIENT-008	A key binding's default key code has no key in the running Minecraft version (warning; the key binding starts unbound, ADR-0029)
PLEXUS-SCHEDULE-001	A scheduled task threw an exception (logged, then continues)
PLEXUS-WORLDGEN-001	Unknown placed feature (stops startup)
PLEXUS-WORLDGEN-002	Declaration after registration closed
PLEXUS-WORLDGEN-003	Cannot access the biome feature or spawn list
PLEXUS-WORLDGEN-004	Invalid or duplicate generator, biome, placed feature, density function, or structure ID, or a density function range that is reversed
PLEXUS-WORLDGEN-005	A code placed feature, density function, or structure threw an exception (logged once, that spot is skipped)
PLEXUS-RESOURCE-001	Invalid reload directory
PLEXUS-RESOURCE-002	Declaration after registration closed
PLEXUS-RESOURCE-003	Could not read a file, or a listener failed (logged, then continues)
PLEXUS-RESOURCE-004	(Build, checkPlexusResources) A resource path that the game skips: uppercase letters, spaces, and so on
PLEXUS-RESOURCE-005	(Build) JSON syntax error. Includes the line and column
PLEXUS-RESOURCE-006	(Build) The model that an item definition, block state, or model parent points to is not in the mod, or the namespace is missing
PLEXUS-RESOURCE-007	(Build) The texture that a model points to is not in the mod, or the namespace is missing
PLEXUS-RESOURCE-008	(Build) A translation file is not an object, or a value is not a string
PLEXUS-RESOURCE-009	(Build, plexusResources) Invalid name, texture, or tool; the same name declared twice; block settings on an item
PLEXUS-RESOURCE-010	A mod jar's pack.mcmeta cannot be read (warning; the mod's pack is used without overlays)
PLEXUS-PERMISSION-001	Invalid or duplicate permission node
PLEXUS-PERMISSION-002	Declaration after registration closed
PLEXUS-PERMISSION-003	Provider exception (that provider is skipped)
PLEXUS-STORAGE-001	The storage was saved by a newer version (left as is)
PLEXUS-BACKUP-001	World backup check failed (loading continues)
PLEXUS-BOOTSTRAP-004	Game layer jar not found
PLEXUS-BOOTSTRAP-005	Game layer failed to start

Entrypoints

Code	Meaning
PLEXUS-ENTRYPOINT-001	Could not load the entrypoint class
PLEXUS-ENTRYPOINT-002	The entrypoint has the wrong shape (does not implement the required interface, or has no public no-argument constructor)
PLEXUS-ENTRYPOINT-003	Exception while running the entrypoint (stops the run)

Metadata — plexus.mod.json / poly.mod.json

Code	Meaning	Level
PLEXUS-METADATA-001	JSON syntax error	Error
PLEXUS-METADATA-002	Required field missing	Error
PLEXUS-METADATA-003	Wrong field type	Error
PLEXUS-METADATA-004	Unsupported schemaVersion	Error
PLEXUS-METADATA-005	Invalid mod ID	Error
PLEXUS-METADATA-006	Invalid version	Error
PLEXUS-METADATA-007	Invalid environment	Error
PLEXUS-METADATA-008	Invalid entrypoint	Error
PLEXUS-METADATA-009	Invalid version range	Error
PLEXUS-METADATA-010	Feature not supported yet (for example, a non-empty provides)	Error
PLEXUS-METADATA-011	Unknown field	Warning
PLEXUS-METADATA-012	Required permission (capabilities) missing	Error
PLEXUS-METADATA-013	Unknown permission	Warning
PLEXUS-METADATA-014	Invalid system replacement declaration	Error
PLEXUS-METADATA-015	Invalid transform declaration	Error
PLEXUS-METADATA-016	Invalid access widening declaration	Error

Dependencies

Code	Meaning
PLEXUS-DEPENDENCY-001	Duplicate mod ID
PLEXUS-DEPENDENCY-002	Required dependency missing
PLEXUS-DEPENDENCY-003	Dependency version mismatch
PLEXUS-DEPENDENCY-004	Dependency cycle
PLEXUS-DEPENDENCY-005	Conflicting mod (conflicts)
PLEXUS-DEPENDENCY-006	Environment does not match
PLEXUS-DEPENDENCY-007	Unsupported Minecraft version
PLEXUS-DEPENDENCY-008	Reserved mod ID
PLEXUS-DEPENDENCY-009	A required mod is installed but is a mod from another loader that cannot be loaded (includes the reason it is blocked)

System replacement

Code	Meaning
PLEXUS-SYSTEM-001	More than one mod replaces the same system (reported with how to resolve it)
PLEXUS-SYSTEM-002	Unknown system
PLEXUS-SYSTEM-003	Provider creation failed, returned null, did not implement the contract, or failed system-specific validation
PLEXUS-SYSTEM-004	System that cannot be replaced
PLEXUS-SYSTEM-005	Invalid override
PLEXUS-SYSTEM-006	The game called a hook before Plexus Mod Loader connected the system

Transforms

Code	Meaning
PLEXUS-TRANSFORM-001	Target class not found
PLEXUS-TRANSFORM-002	Target method (name + descriptor) not found
PLEXUS-TRANSFORM-003	Bytecode precondition failed
PLEXUS-TRANSFORM-004	Rules that change the same method conflict: after does not define a single order, or the actions cannot be combined (all rejected)
PLEXUS-TRANSFORM-005	Verification of the transform result failed
PLEXUS-TRANSFORM-006	Game version mismatch
PLEXUS-TRANSFORM-007	Duplicate rule ID
PLEXUS-TRANSFORM-008	Cache entry corrupt (deleted and transformed again, warning)
PLEXUS-TRANSFORM-009	Cache write or cleanup failed, or the limit is still exceeded after cleanup (warning, loading continues)
PLEXUS-TRANSFORM-010	Access widening target (class or exact member) not found
PLEXUS-TRANSFORM-011	(Warning) A call redirect is left out of one class because another loader's transformer (a Fabric mod's Mixin @Redirect or @WrapOperation) already replaced or moved that call. The class still loads

Compatibility with other loaders

Code	Meaning
PLEXUS-COMPAT-001	Mod from a loader with no bridge (blocked)
PLEXUS-COMPAT-002	The bridge failed while reading metadata (only that jar is blocked)
PLEXUS-COMPAT-003	The bridge failed to prepare the launch (prepareLaunch, for example building the Fabric Loader API) (stops startup before the entry points)
PLEXUS-COMPAT-100	Fabric: metadata (including format errors and unreadable version conditions, and a mixins list that cannot be read)
PLEXUS-COMPAT-101	Retired (2026-10-22). Mixin no longer blocks a mod by itself. Mixin configurations are judged with 131, 132, and 136
PLEXUS-COMPAT-102	Retired (2026-10-21). A class tweaker no longer blocks a mod by itself. Its access lines are applied as access widenings (125 to 130)
PLEXUS-COMPAT-103	Retired (2026-10-21). A nested jar is no longer blocked by itself. It is unpacked and judged (120 to 124)
PLEXUS-COMPAT-104	Retired (2026-10-21). A dependency on another mod is no longer blocked by itself. It is judged with 114
PLEXUS-COMPAT-105, 106	Retired (2026-10-22). preLaunch and :: entrypoint values run as in Fabric Loader
PLEXUS-COMPAT-107, 108	Fabric: other entrypoints (warning, other mods can receive them with FabricLoader.getEntrypoints), runtime environment
PLEXUS-COMPAT-110	A Fabric entrypoint threw an exception (stops startup)
PLEXUS-COMPAT-111	Link check: uses a loader runtime class or method that Plexus Mod Loader does not provide (for example, Fabric Loader internal classes such as FabricLauncherBase)
PLEXUS-COMPAT-112	Link check: references a Minecraft class, method, or field that does not exist in this game version
PLEXUS-COMPAT-113	Link check (warning): a class of a mod that is not installed, a client class or a class of a client-only mod referenced on a dedicated server, a JDK incubator class, or a game member whose types no installed jar has
PLEXUS-COMPAT-114	A required dependency is missing, blocked, or has the wrong version (including minecraft and java). For a blocked dependency, the reason is included. Quilt mods' depends follow Quilt Loader's rules: a bare version such as 1.0.0 means ^1.0.0, optional dependencies are checked only when that mod is installed, and a list of IDs means any of them
PLEXUS-COMPAT-115	A mod declared in breaks is installed
PLEXUS-COMPAT-116	A mod declared in conflicts is installed (warning)
PLEXUS-COMPAT-117	Same ID (including aliases) as another installed mod
PLEXUS-COMPAT-118	Link check: a class file this Java cannot read, or a JDK class that does not exist
PLEXUS-COMPAT-119	Link check: the declared entrypoint class is in no jar
PLEXUS-COMPAT-120	(Warning) A mod that came from a nested jar: the jar that held it, and the path
PLEXUS-COMPAT-121	The outer jar that holds a nested mod is not loaded
PLEXUS-COMPAT-122	Another copy of the same mod is used (Plexus Mod > directly installed mod > nested copy with the highest version)
PLEXUS-COMPAT-123	A nested jar listed in jars is missing or unreadable, or nesting is deeper than 8 levels (blocks the outer mod)
PLEXUS-COMPAT-124	(Warning) Loaded, but some nested mods inside it are not loaded, so it works only in part. Nested mods left out only because they are for the other side (108, 305, such as Fabric API's client modules on a server) do not count: Fabric Loader and Quilt Loader leave them out there too
PLEXUS-COMPAT-125	Fabric class tweaker: the file named by accessWidener is missing or unreadable, or has lines Fabric Loader would refuse. Each bad line is listed as file:line message
PLEXUS-COMPAT-126	Fabric class tweaker: the namespace is not official (for example intermediary, which would need mappings that this game version does not have)
PLEXUS-COMPAT-127	Retired (2026-10-22). Class tweaker inject-interface and extend-enum lines are applied as in Fabric Loader
PLEXUS-COMPAT-128	Link check: a class tweaker target that is a class outside the game jar. Blocks the mod and, in turn, its dependents (with file:line)
PLEXUS-COMPAT-129	(Informational) What a class tweaker widens
PLEXUS-COMPAT-130	Link check (warning): on a dedicated server, class tweaker lines for client classes are left out
PLEXUS-COMPAT-131	(Informational) The mod's Mixin configurations and which of them apply on this side
PLEXUS-COMPAT-132	A Mixin configuration marked required needs a newer Mixin. Mixin would stop the game, so the mod is left out
PLEXUS-COMPAT-133	A loader bridge's transformer (Fabric: environment stripping, interface injection, Mixin) failed on a class. The class does not load; the error names the class and, for Mixin, the mixin and its mod
PLEXUS-COMPAT-134	Mixin could not start: a configuration cannot be used, two mods use the same configuration (Fabric Loader refuses this too), or Mixin failed to enter a phase. Stops startup
PLEXUS-COMPAT-135	Link check: a class tweaker inject-interface line names an interface that no installed jar has. Blocks the mod
PLEXUS-COMPAT-136	(Warning) A Mixin configuration that is missing, is not a JSON object, or is not required and needs a newer Mixin. Mixin logs an error and skips it, as under Fabric Loader
PLEXUS-COMPAT-137	Link check (warning): a class tweaker line (access widening or interface injection) whose class or exact member this game version does not have. It is left out, as Fabric Loader applies such a line to nothing
PLEXUS-COMPAT-138	Retired (2026-10-25, ADR-0030). A Fabric mixin that does not fit the host loader's patch is no longer left out while the rest of the mod runs. The mod is not loaded (224); a mixin Plexus Mod Loader moves to the patch and that works as written is 226
PLEXUS-COMPAT-139	A Fabric or Quilt mod that MinecraftForge or NeoForge also loads as its own mod (the same mod built for both loaders: the same mod ID, the ID as FML spells it, a provided ID, or most of its classes) is not loaded; the Forge or NeoForge build runs. When the two builds are mostly the same classes, it meets the mods that need the left-out build; otherwise they are left out by the dependency check
PLEXUS-COMPAT-140	A Fabric or Quilt mod's mixin has an injection point whose target Mixin itself refuses (for example "Lpkg/Type;name:()V", a colon before the descriptor). In a required Mixin configuration the target class would not load, so the mod is left out before the game starts (blocking); in an optional one Mixin skips that mixin (warning). Fabric Loader and Quilt Loader use the same Mixin
PLEXUS-COMPAT-141	Link check: next to a host loader, a mod carries its own copy of a class in the host loader's packages (for example FML's config classes) and uses a class or member that the host's class of that name lacks. The host's class is the one that runs, so the mod is left out before the game starts (blocking)
PLEXUS-COMPAT-200–204	NeoForge (neoforge.mods.toml) and Forge (mods.toml), each reported by its own bridge: metadata, FML language provider, Mixin, Access Transformer, dependencies (warning)
PLEXUS-COMPAT-205	NeoForge and Forge library jar (FMLModType manifest, blocked)
PLEXUS-COMPAT-206	MinecraftForge's files (installer, libraries, patched game jar) could not be prepared, or Plexus Mod Loader's class path lacks Forge's file systems; the Forge mods are not loaded
PLEXUS-COMPAT-207	Retired in 0.1.0-alpha.14: Forge mods and Fabric mods now run together. Not reused
PLEXUS-COMPAT-208	FML failed while starting (launch stops; the log has FML's own error)
PLEXUS-COMPAT-209	A Forge mod FML would refuse is left out before FML starts, so the others still run: its language loader or forge/minecraft version range does not match, a required mod is missing or left out, an installed dependency's version is outside its range, or it is a client-only mod on a server (@OnlyIn(Dist.CLIENT) @Mod class, or minecraft needed on the client side only). Mods that need it are left out too
PLEXUS-COMPAT-210	With MinecraftForge on the client, Plexus Mod Loader cannot reach Forge's BrandingControl.forEachLine, which it calls to draw Forge's title screen branding with the mod counts per loader above it. The title screen fails to draw; the message names the method. Forge's patched title screen calls the same method, so this means a damaged Forge installation
PLEXUS-COMPAT-211	Forge's ModList.getModFileById or ModList.isLoaded is not the code Plexus Mod Loader checked, so it is left unchanged: Forge mods do not see the Fabric mods and Plexus Mods in the same game through it. The launch goes on (ADR-0025)
PLEXUS-COMPAT-212	(information) With MinecraftForge in the same game, a Fabric mod's mixin is adjusted to a class Forge patched and works as written: an accessor or invoker, or a method the mixin adds, that Forge's patch added with the same code is left to Forge's method; or a local an injection captures by name, which Forge's patch renamed, is captured under its new name
PLEXUS-COMPAT-213	Retired (2026-10-25, ADR-0030). A mixin method that the host's patch also adds with other code is no longer renamed or allowed to replace the host's method. The mod is not loaded (224)
PLEXUS-COMPAT-214	Retired (2026-10-25, ADR-0030). An accessor of a field whose type the host's patch changed no longer throws when called. The mod is not loaded (224)
PLEXUS-COMPAT-215	(NeoForge) NeoForge's FMLLoader is not the code Plexus Mod Loader checked, so Plexus Mod Loader cannot make its game class loader define NeoForge's game layer; the launch stops instead of letting FML's own class loader own the game. The message names what was not found. It means a NeoForge release Plexus Mod Loader has not checked.
PLEXUS-COMPAT-216	(NeoForge) NeoForge cannot run in this launch, so its mods are left out and the rest of the game starts: Plexus Mod Loader has no NeoForge release for this Minecraft version, NeoForge's files cannot be downloaded or checked, Fabric or Quilt mods are in the same game and NeoForge's Mixin start is not the code Plexus Mod Loader checked (with the checked NeoForge versions, NeoForge mods run together with Fabric and Quilt mods), or Plexus Mod Loader was started without its Java agent, which NeoForge needs (the installed launcher profile and server start it). The message names the reason.
PLEXUS-COMPAT-217	(NeoForge) A NeoForge mod that NeoForge's FML would refuse is left out before FML starts, so the other mods still run (FML would stop the whole launch). The reasons are those FML 11 checks in neoforge.mods.toml: the javafml loader version, a required mod that is missing or left out, a neoforge, minecraft or other mod version outside the declared range, or an incompatible mod that is installed. Mods that need the left-out mod are left out too.
PLEXUS-COMPAT-218	(NeoForge) NeoForge's ModList.getModFileById or ModList.isLoaded is not the code Plexus Mod Loader checked, so it is left unchanged: NeoForge mods do not see the Plexus Mods in the same game through it. The launch goes on (ADR-0025, ADR-0026)
PLEXUS-COMPAT-220	(NeoForge, with Fabric or Quilt mods) A NeoForge mod's mixin is skipped because its target class was loaded before Mixin selected the mod's configuration: another mod's Mixin plugin loaded it while Mixin was selecting configurations. Only the mixins into that class are skipped; the rest of the configuration applies. The rest of the game runs; that part of the mod does not (ADR-0026 30, 43)
PLEXUS-COMPAT-221	(NeoForge) MinecraftForge mods are in the same game, so NeoForge does not run and its mods are not loaded: Forge and NeoForge each patch the game's classes their own way, and one game can hold only one of them. Each NeoForge mod is then diagnosed as without NeoForge. Remove the Forge mods or the NeoForge mods (ADR-0026 34)
PLEXUS-COMPAT-222	(information) A Fabric mod's mixin injects into a method that the host loader's patch makes a subclass's override call through super, where vanilla's override does not (NeoForge's play listener passes custom payloads on to its parent class; Fabric API's handler there expects only the configuration listener). The injection keeps to the receivers it has in vanilla: it does not run for that subclass, whose own code runs as the host intends. Nothing to do (ADR-0026 41)
PLEXUS-COMPAT-223	(NeoForge or Forge, with Fabric or Quilt mods) A game interface gets a default method of the same name and descriptor from the host loader's patch and from a Fabric mod's interface (class tweaker or mixin); the JVM would refuse every call of it (Conflicting default methods). The interface keeps the host's default and overrides still win. Shown as information when both defaults have the same code; as limited when the code differs, because a call through the mod's interface then runs the host's default (ADR-0026 42)
PLEXUS-COMPAT-224	(NeoForge or Forge, with Fabric or Quilt mods) The mod is not loaded, because some of its mixins cannot work as written on the game the host loader patched: a member a mixin uses is gone, an injection point is gone with no replacement, a handler cannot match the patched method, an injection would replace a value the host computes, an injection depends on one that cannot work, or a member or default method collides with the host's. The message lists each mixin and why. This is a limitation of Plexus Mod Loader, not a bug in the mod: report it to Plexus Mod Loader, not to the mod's author. Mods that need it are not loaded either (114). The title screen counts these mods (ADR-0030)
PLEXUS-COMPAT-225	(NeoForge or Forge, with Fabric or Quilt mods) A Fabric or Quilt mod's mixin failed on the host loader's patched game in a way Plexus Mod Loader's check before the launch did not foresee. The game stops, as it would under Fabric Loader (before the game starts when the second check finds it, else at Mixin's error). The message names the mod to remove. A limitation of Plexus Mod Loader, not a bug in the mod: report it to Plexus Mod Loader (ADR-0030)
PLEXUS-COMPAT-226	(information) With NeoForge or Forge in the same game, a Fabric mod's mixin is moved to where the host loader's patch put the same thing, and works as written: an injection point the host moved, a method whose parameters the patch only added to or reordered, a call that gained trailing arguments, a call moved into a helper (ADR-0030)
PLEXUS-COMPAT-227	(Forge, with Fabric or Quilt mods) MinecraftForge's registries are not the code Plexus Mod Loader checked (a member it uses is missing, or a registry's write check reads a flag it does not open), so it cannot open them for Fabric and Quilt mods to register into. Stops the launch before those mods run; Forge mods run alone
PLEXUS-COMPAT-219	Retired (2026-10-24, before any release used it). Plexus Mod Loader no longer calls NeoForge's BrandingControl itself: it adds the mod counts per loader to the list NeoForge's branding is drawn from, so there is nothing to reach. If NeoForge builds its branding differently, the mod counts are left out and the rule is reported as off
PLEXUS-COMPAT-300	Quilt: quilt.mod.json is metadata Quilt Loader would refuse (not a JSON object, a schema_version other than 1, a missing or invalid id, group or version, a malformed entrypoints, jars, depends, breaks, provides, mixin or access_widener, an unreadable version range, an unknown intermediate_mappings or required_features). Blocks the mod; nothing else is reported for it
PLEXUS-COMPAT-301	Quilt: the mod declares a loader plugin (experimental_quilt_loader_plugin). Plexus Mod Loader does not provide Quilt Loader's plugin API. Blocks the mod
PLEXUS-COMPAT-302	Quilt: the mod uses a language adapter (language_adapters, or an entrypoint whose adapter is not default). No Quilt language adapter exists for Minecraft 26.x. Blocks the mod
PLEXUS-COMPAT-303	Quilt (warning): QSL entrypoints (init, client_init, server_init) are not run. Quilt Loader does not run them either without QSL, which has no release for Minecraft 26.x
PLEXUS-COMPAT-304	Quilt (warning): another entrypoint key (for example modmenu) that Plexus Mod Loader does not run; other mods can receive it with QuiltLoader.getEntrypoints or FabricLoader.getEntrypoints (like Fabric 107)
PLEXUS-COMPAT-305	Quilt: minecraft.environment is for the other side (a client mod on a dedicated server, a dedicated_server mod on the client). Not loaded (like Fabric 108)
PLEXUS-COMPAT-306	Quilt: required_features asks for the modifiable file system overlay (modifiable_filesystem_overlay), which Plexus Mod Loader does not provide. Blocks the mod
PLEXUS-COMPAT-307	Quilt (not an error): a nested Quilt mod that loads only when required (load_type if_required, the default) and that no loaded mod requires. Not loaded, as under Quilt Loader; not counted in the outer mod's 124
PLEXUS-COMPAT-308	Quilt: the mod depends on a QSL or Quilted Fabric API module (for example quilt_base, quilt_resource_loader, quilted_fabric_api). Neither has a release for Minecraft 26.x, so the dependency cannot be met under Quilt Loader either. The mod is left out with 114; this code gives the reason
PLEXUS-COMPAT-309	Quilt (information): values Quilt Loader reads that have no effect in this launch: repositories, intermediate_mappings (26.x is not remapped), unknown quilt_loader keys, a top-level environment
PLEXUS-COMPAT-310	(Warning) The jar has both fabric.mod.json and quilt.mod.json. Plexus Mod Loader runs it as a Fabric mod, so jars that already run as Fabric mods keep doing so; Quilt Loader would read quilt.mod.json instead

More details are in Compatibility.

Bootstrap and discovery

Code	Meaning
PLEXUS-BOOTSTRAP-001	Cannot read the game jar
PLEXUS-BOOTSTRAP-002	No version adapter for this Minecraft version
PLEXUS-BOOTSTRAP-003	Launch configuration error
PLEXUS-BOOTSTRAP-004	Game layer jar not found
PLEXUS-BOOTSTRAP-005	Game layer failed to start
PLEXUS-BOOTSTRAP-006	plexus.gameJar is not set, and the launch class path has no game jar (a jar with version.json) or more than one. Reinstall with the installer, or set -Dplexus.gameJar
PLEXUS-BOOTSTRAP-007	The game stopped with an error that reached Plexus Mod Loader's launcher; Plexus Mod Loader logs it and exits with status 1, so threads mods started do not keep the process running without a game
PLEXUS-DISCOVERY-002	A jar with no known mod metadata (not loaded)
PLEXUS-DISCOVERY-003	A file that cannot be read as a jar (for example, an interrupted download, not loaded). Plexus Mod Loader keeps judging the other mods

Shutdown and events

Code	Meaning
PLEXUS-SHUTDOWN-001	A shutdown task failed (the rest continue)
PLEXUS-SHUTDOWN-002	Registration after shutdown started
PLEXUS-EVENT-001	Listener exception (that listener is disabled)
PLEXUS-EVENT-002	The server accessor does not match the version adapter
PLEXUS-EVENT-003	A decision event listener returned null (that listener is disabled, and its answer counts as PASS)