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NeoForge 1.21.1 Crash Report

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Minecraft version: 1.21.1 Java version: 21.0.7 NeoForge version: 21.1.264
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---- Minecraft Crash Report ----
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// Don't be sad, have a hug! <3
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Time: 2026-10-21 02:16:47
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Description: Mod loading failures have occurred; consult the issue messages for more details
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net.neoforged.neoforge.logging.CrashReportExtender$ModLoadingCrashException: Mod loading has failed
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A detailed walkthrough of the error, its code path and all known details is as follows:
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---------------------------------------------------------------------------------------
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-- Head --
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Thread: Render thread
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Stacktrace:
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at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1229) ~[?:?] {}
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-- Mod loading issue for: wetland_whimsy --
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Details:
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Mod file: /C:/Users/********/AppData/Roaming/PrismLauncher/instances/actualy why/minecraft/mods/wetland_whimsy-2.1.0-1.21.1.jar
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Failure message: Wetland Whimsy (wetland_whimsy) encountered an error while dispatching the net.neoforged.fml.event.lifecycle.FMLCommonSetupEvent event
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java.util.ConcurrentModificationException: null
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Mod version: 2.1.0-1.21.1
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Mod issues URL: https://codeberg.org/junideergirl/WetlandWhimsy/issues
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Exception message: java.util.ConcurrentModificationException
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Stacktrace:
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at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1229) ~[?:?] {}
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at TRANSFORMER/biolith@3.0.14/com.terraformersmc.biolith.impl.biome.DimensionBiomePlacement.addSubBiome(DimensionBiomePlacement.java:102) ~[biolith-neoforge-3.0.14.jar%23187!/:?] {re:mixin,re:classloading}
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at TRANSFORMER/biolith@3.0.14/com.terraformersmc.biolith.api.biome.BiomePlacement.addSubOverworld(BiomePlacement.java:174) ~[biolith-neoforge-3.0.14.jar%23187!/:?] {re:classloading}
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at TRANSFORMER/wetland_whimsy@2.1.0-1.21.1/uwu.juni.wetland_whimsy.events.WetlandWhimsyBootstap.marshification(WetlandWhimsyBootstap.java:27) ~[wetland_whimsy-2.1.0-1.21.1.jar%23191!/:?] {re:classloading}
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at TRANSFORMER/wetland_whimsy@2.1.0-1.21.1/uwu.juni.wetland_whimsy.events.WetlandWhimsyBootstap.commonSetup(WetlandWhimsyBootstap.java:19) ~[wetland_whimsy-2.1.0-1.21.1.jar%23191!/:?] {re:classloading}
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at MC-BOOTSTRAP/net.neoforged.bus/net.neoforged.bus.EventBus.post(EventBus.java:360) ~[bus-8.0.5.jar%23156!/:?] {}
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at MC-BOOTSTRAP/net.neoforged.bus/net.neoforged.bus.EventBus.post(EventBus.java:328) ~[bus-8.0.5.jar%23156!/:?] {}
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at MC-BOOTSTRAP/fml_loader@4.0.45/net.neoforged.fml.ModContainer.acceptEvent(ModContainer.java:158) ~[loader-4.0.45.jar%23153!/:4.0] {}
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at MC-BOOTSTRAP/fml_loader@4.0.45/net.neoforged.fml.ModLoader.lambda$dispatchParallelEvent$4(ModLoader.java:172) ~[loader-4.0.45.jar%23153!/:4.0] {}
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at MC-BOOTSTRAP/fml_loader@4.0.45/net.neoforged.fml.ModLoader.lambda$dispatchParallelTask$7(ModLoader.java:231) ~[loader-4.0.45.jar%23153!/:4.0] {}
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at java.base/java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:934) ~[?:?] {}
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at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:911) ~[?:?] {}
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at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483) ~[?:?] {}
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at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387) ~[?:?] {}
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at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312) ~[?:?] {}
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at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843) ~[?:?] {}
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at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808) ~[?:?] {}
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at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188) ~[?:?] {}
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-- System Details --
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Details:
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Minecraft Version: 1.21.1
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Minecraft Version ID: 1.21.1
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Operating System: Windows 11 (amd64) version 10.0
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Java Version: 21.0.7, Microsoft
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Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
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Memory: 343964064 bytes (328 MiB) / 1291845632 bytes (1232 MiB) up to 7516192768 bytes (7168 MiB)
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CPUs: 12
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Processor Vendor: AuthenticAMD
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Processor Name: AMD Ryzen 5 7600 6-Core Processor
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Identifier: AuthenticAMD Family 25 Model 97 Stepping 2
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Microarchitecture: Zen 3
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Frequency (GHz): 3.79
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Number of physical packages: 1
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Number of physical CPUs: 6
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Number of logical CPUs: 12
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Graphics card #0 name: AMD Radeon(TM) Graphics
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Graphics card #0 vendor: Advanced Micro Devices, Inc.
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Graphics card #0 VRAM (MiB): 512.00
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Graphics card #0 deviceId: VideoController1
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Graphics card #0 versionInfo: 32.0.21045.5002
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Graphics card #1 name: AMD Radeon RX 7600
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Graphics card #1 vendor: Advanced Micro Devices, Inc.
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Graphics card #1 VRAM (MiB): 8176.00
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Graphics card #1 deviceId: VideoController2
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Graphics card #1 versionInfo: 32.0.31041.1004
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Memory slot #0 capacity (MiB): 16384.00
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Memory slot #0 clockSpeed (GHz): 4.80
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Memory slot #0 type: Unknown
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Virtual memory max (MiB): 27866.52
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Virtual memory used (MiB): 19280.93
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Swap memory total (MiB): 12288.00
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Swap memory used (MiB): 334.62
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Space in storage for jna.tmpdir (MiB): <path not set>
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Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): <path not set>
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Space in storage for io.netty.native.workdir (MiB): <path not set>
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Space in storage for java.io.tmpdir (MiB): available: 268177.94, total: 952952.00
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Space in storage for workdir (MiB): available: 268177.94, total: 952952.00
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JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms1024m -Xmx7168m
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ModLauncher: 11.0.5+main.901c6ea8
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ModLauncher launch target: forgeclient
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ModLauncher services:
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sponge-mixin-0.16.4+mixin.0.8.7.jar mixin PLUGINSERVICE
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loader-4.0.45.jar slf4jfixer PLUGINSERVICE
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loader-4.0.45.jar runtime_enum_extender PLUGINSERVICE
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at-modlauncher-10.0.1.jar accesstransformer PLUGINSERVICE
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loader-4.0.45.jar runtimedistcleaner PLUGINSERVICE
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modlauncher-11.0.5.jar mixin TRANSFORMATIONSERVICE
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modlauncher-11.0.5.jar fml TRANSFORMATIONSERVICE
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FML Language Providers:
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javafml@4.0
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lowcodefml@4.0
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minecraft@4.0
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Mod List:
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biolith-neoforge-3.0.14.jar |Biolith |biolith |3.0.14 |Manifest: NOSIGNATURE
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biomesbf-neoforge-1.21.1-1.0.0.jar |Biomes of Bountiful Fares |biomesbf |1.0.0 |Manifest: NOSIGNATURE
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bountifulfares-neoforge-1.21.1-3.0.13.jar |Bountiful Fares |bountifulfares |3.0.13 |Manifest: NOSIGNATURE
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client-1.21.1-20240808.144430-srg.jar |Minecraft |minecraft |1.21.1 |Manifest: ****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****
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neoforge-21.1.264-universal.jar |NeoForge |neoforge |21.1.264 |Manifest: NOSIGNATURE
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nexuslib-neoforge-1.21.1-1.2.0.jar |NexusLib |nexuslib |1.2.0 |Manifest: NOSIGNATURE
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trimmed-1.21-3.0.0+neoforge.jar |Trimmed |trimmed |3.0.0 |Manifest: NOSIGNATURE
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wetland_whimsy-2.1.0-1.21.1.jar |Wetland Whimsy |wetland_whimsy |2.1.0-1.21.1 |Manifest: NOSIGNATURE
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Crash Report UUID: 865091d5-49b3-49be-a688-3326f32cb9f9
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FML: 4.0.45
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NeoForge: 21.1.264
mclo.gs
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