java.lang.NoSuchFieldError: a

[TheSalts]

Im using Minecraftdev plugin on intelliJ
I didnt write any code but crashed

[15:05:59] [main/INFO] (FabricLoader/GameProvider) Loading Minecraft 1.18 with Fabric Loader 0.12.11
[15:05:59] [main/INFO] (FabricLoader) Loading 51 mods:
- fabric 0.44.0+1.18
- fabric-api-base 0.4.1+b4f4f6cdc8
- fabric-api-lookup-api-v1 1.4.0+16d92c47c8
- fabric-biome-api-v1 6.0.1+ded849a9c8
- fabric-blockrenderlayer-v1 1.1.9+3ac43d95c8
- fabric-command-api-v1 1.1.6+3ac43d95c8
- fabric-commands-v0 0.2.5+b4f4f6cdc8
- fabric-containers-v0 0.1.18+d154e2c6c8
- fabric-content-registries-v0 0.4.5+6f53a73dc8
- fabric-crash-report-info-v1 0.1.8+3ac43d95c8
- fabric-data-generation-api-v1 1.0.0+3fec4ad9c8
- fabric-dimensions-v1 2.1.7+43d29571c8
- fabric-entity-events-v1 1.4.5+6b21378ac8
- fabric-events-interaction-v0 0.4.16+bfa23f17c8
- fabric-events-lifecycle-v0 0.2.6+b4f4f6cdc8
- fabric-game-rule-api-v1 1.0.10+3ac43d95c8
- fabric-gametest-api-v1 1.0.5+03d159cfc8
- fabric-item-api-v1 1.3.0+691a79b5c8
- fabric-item-groups-v0 0.3.3+3ac43d95c8
- fabric-key-binding-api-v1 1.0.8+c8aba2f3c8
- fabric-keybindings-v0 0.2.6+b4f4f6cdc8
- fabric-lifecycle-events-v1 1.4.10+c15ca335c8
- fabric-loot-tables-v1 1.0.8+3ac43d95c8
- fabric-mining-level-api-v1 1.0.3+3ac43d95c8
- fabric-mining-levels-v0 0.1.7+b4f4f6cdc8
- fabric-models-v0 0.3.3+3ac43d95c8
- fabric-networking-api-v1 1.0.18+3ac43d95c8
- fabric-networking-v0 0.3.5+b4f4f6cdc8
- fabric-object-builder-api-v1 1.11.0+3b82842ec8
- fabric-object-builders-v0 0.7.8+3ac43d95c8
- fabric-particles-v1 0.2.9+526dc1acc8
- fabric-registry-sync-v0 0.8.5+3ac43d95c8
- fabric-renderer-api-v1 0.4.9+3ac43d95c8
- fabric-renderer-indigo 0.4.12+3ac43d95c8
- fabric-renderer-registries-v1 3.2.7+b4f4f6cdc8
- fabric-rendering-data-attachment-v1 0.3.4+7242e9d7c8
- fabric-rendering-fluids-v1 0.1.18+3ac43d95c8
- fabric-rendering-v0 1.1.9+b4f4f6cdc8
- fabric-rendering-v1 1.10.3+6b21378ac8
- fabric-resource-loader-v0 0.4.11+3ac43d95c8
- fabric-screen-api-v1 1.0.7+3ac43d95c8
- fabric-screen-handler-api-v1 1.1.11+3ac43d95c8
- fabric-structure-api-v1 2.0.8+295197a7c8
- fabric-tag-extensions-v0 1.2.5+3ac43d95c8
- fabric-textures-v0 1.0.9+3ac43d95c8
- fabric-tool-attribute-api-v1 1.3.4+7de09f55c8
- fabric-transfer-api-v1 1.5.5+b4f4f6cdc8
- fabricloader 0.12.11
- java 17
- minecraft 1.18
- salt 0.0.1
[15:05:59] [main/INFO] (FabricLoader/Mixin) SpongePowered MIXIN Subsystem Version=0.8.4 Source=file:/C:/Users/user/.gradle/caches/modules-2/files-2.1/net.fabricmc/sponge-mixin/0.10.7+mixin.0.8.4/7a4ca9d54d9ae564dea0363d668036a8420ed9b8/sponge-mixin-0.10.7+mixin.0.8.4.jar Service=Knot/Fabric Env=CLIENT
[15:05:59] [main/INFO] (FabricLoader/Mixin) Loaded Fabric development mappings for mixin remapper!
[15:05:59] [main/INFO] (FabricLoader/Mixin) Compatibility level set to JAVA_16
[15:06:03] [main/WARN] (FabricLoader/Mixin) @Inject(@at("INVOKE")) Shift.BY=3 on fabric-lifecycle-events-v1.mixins.json:client.WorldChunkMixin::handler$zzo000$onLoadBlockEntity exceeds the maximum allowed value: 0. Increase the value of maxShiftBy to suppress this warning.
[15:06:04] [main/ERROR] (FabricLoader) Minecraft has crashed!
net.fabricmc.loader.impl.FormattedException: java.lang.NoSuchFieldError: a
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:604) ~[fabric-loader-0.12.11.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:77) [fabric-loader-0.12.11.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.12.11.jar:?]
at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) [dev-launch-injector-0.2.1+build.8.jar:?]
Caused by: java.lang.NoSuchFieldError: a
at net.minecraft.util.dynamic.Codecs$Lazy.toString(Codecs.java:246) ~[[email protected]:?]
at com.mojang.serialization.Codec.lambda$fieldOf$1(Codec.java:175) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapCodec$1.toString(MapCodec.java:44) ~[datafixerupper-4.0.26.jar:?]
at java.lang.String.valueOf(String.java:4215) ~[?:?]
at java.lang.StringBuilder.append(StringBuilder.java:169) ~[?:?]
at com.mojang.serialization.codecs.RecordCodecBuilder$Instance$5.toString(RecordCodecBuilder.java:341) ~[datafixerupper-4.0.26.jar:?]
at java.lang.String.valueOf(String.java:4215) ~[?:?]
at java.lang.StringBuilder.append(StringBuilder.java:169) ~[?:?]
at com.mojang.serialization.codecs.RecordCodecBuilder$2.toString(RecordCodecBuilder.java:122) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapCodec$MapCodecCodec.toString(MapCodec.java:101) ~[datafixerupper-4.0.26.jar:?]
at java.lang.String.valueOf(String.java:4215) ~[?:?]
at java.lang.StringBuilder.append(StringBuilder.java:169) ~[?:?]
at com.mojang.serialization.codecs.ListCodec.toString(ListCodec.java:82) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.Codec.flatXmap(Codec.java:167) ~[datafixerupper-4.0.26.jar:?]
at net.minecraft.util.dynamic.Codecs.nonEmptyList(Codecs.java:212) ~[[email protected]:?]
at net.minecraft.util.math.Spline.method_39233(Spline.java:115) ~[[email protected]:?]
at com.mojang.serialization.codecs.RecordCodecBuilder.create(RecordCodecBuilder.java:72) ~[datafixerupper-4.0.26.jar:?]
at net.minecraft.util.math.Spline.method_39232(Spline.java:113) ~[[email protected]:?]
at net.minecraft.world.biome.source.util.VanillaTerrainParameters.(VanillaTerrainParameters.java:32) ~[[email protected]:?]
at net.minecraft.world.gen.chunk.GenerationShapeConfig.method_28582(GenerationShapeConfig.java:27) ~[[email protected]:?]
at com.mojang.serialization.codecs.RecordCodecBuilder.create(RecordCodecBuilder.java:72) ~[datafixerupper-4.0.26.jar:?]
at net.minecraft.world.gen.chunk.GenerationShapeConfig.(GenerationShapeConfig.java:24) ~[[email protected]:?]
at net.minecraft.world.gen.chunk.ChunkGeneratorSettings.method_28558(ChunkGeneratorSettings.java:61) ~[[email protected]:?]
at com.mojang.serialization.codecs.RecordCodecBuilder.create(RecordCodecBuilder.java:72) ~[datafixerupper-4.0.26.jar:?]
at net.minecraft.world.gen.chunk.ChunkGeneratorSettings.(ChunkGeneratorSettings.java:38) ~[[email protected]:?]
at net.minecraft.util.registry.BuiltinRegistries.method_30566(BuiltinRegistries.java:100) ~[[email protected]:?]
at java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) ~[?:?]
at net.minecraft.util.registry.BuiltinRegistries.(BuiltinRegistries.java:99) ~[[email protected]:?]
at net.minecraft.util.registry.Registry.(Registry.java:413) ~[[email protected]:?]
at net.minecraft.Bootstrap.initialize(Bootstrap.java:55) ~[[email protected]:?]
at net.minecraft.client.main.Main.main(Main.java:148) ~[[email protected]:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:602) ~[fabric-loader-0.12.11.jar:?]
... 3 more

[warjort]

Caused by: java.lang.NoSuchFieldError: a
at net.minecraft.util.dynamic.Codecs$Lazy.toString(Codecs.java:246) ~[[email protected]:?]

This appears to be some kind of error in the mapping of your minecraft jar to deobfuscated names.
It looks like you are using yarn mappings? In which case that field "a" should be "delegate".

When I try this with a gradle project (the example fabric mod for 1.18)
https://github.com/FabricMC/fabric-example-mod
I do see "delegate" being used as the field name.

$ javap -cp .gradle/loom-cache/1.18.1/net.fabricmc.yarn.1_18_1.1.18.1+build.1-v2/minecraft-project-\@-mapped.jar -c net.minecraft.util.dynamic.Codecs.Lazy | grep getfield
       1: getfield      #60                 // Field delegate:Ljava/util/function/Supplier;
       1: getfield      #60                 // Field delegate:Ljava/util/function/Supplier;
       1: getfield      #60                 // Field delegate:Ljava/util/function/Supplier;

Obvious things to try are

• recreating the project from scratch in case the gradle/loom cache has some old broken stuff in it.
• deleting the ".gradle" folder (note the . at the start of the name) in your project - this is the above mentioned cache but it makes sure everything is gone and therefore not being used

If that doesn't work, then there is either some problem with how "Minecraftdev" is telling fabric loom to generate the deobfuscated minecraft jar or fabric loom has a bug when it is invoked in the way minecraftdev does things.
To figure that out would require knowing exactly what steps you used to create your project.
e.g. versions of software (intellij, minecraftdev, fabric loom, etc.), configuration files used/changed, ... the usual stuff

You would also likely get more help if you asked on the minecraftdev issues page or discord.
They will know better how their software works.

[modmuss50]

Update to loom 0.10-SNAPSHOT near the top of your build.gradle file. And then run ./gradlew --refresh-dependencies to regenerate the jar.

This has happened as you are using an outdated version of loom for MC 1.18