Missing or corrupted mod files

Oct 13, 2025 by wbrum.org 100 views

Introduction

Launching the Minecraft client on Fabric 1.20.1 can be a frustrating experience, especially when it crashes without any apparent reason. In this article, we will delve into the possible causes of this issue and provide a step-by-step guide to troubleshoot and resolve the problem.

Symptoms

The crash occurs when launching the client on Fabric 1.20.1, and it is not specific to any particular mod or version. The error message is not very informative, and it does not provide any clear indication of the cause of the crash.

Crash Report

The crash report is a detailed log file that contains information about the crash, including the time, description, and stacktrace. The report is as follows:

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 2025-03-10 15:59:53
Description: Initializing game

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'mmoparties' at 'dev.matthe815.mmoparties.fabric.core.MMOParties'!
	at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
	at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
	at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
	at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
	at knot//net.minecraft.class_310.<init>(class_310.java:458)
	at knot//net.minecraft.client.main.Main.main(Main.java:211)
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
	at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
	at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
	at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)
Caused by: net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'main' provided by 'mmoparties'
	at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:56)
	at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399)
	... 9 more
Caused by: net.fabricmc.loader.api.LanguageAdapterException: java.lang.reflect.InvocationTargetException
	at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:60)
	at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124)
	at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53)
	... 10 more
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
	at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:58)
	... 12 more
Caused by: java.lang.NoClassDefFoundError: net/minecraft/resources/ResourceLocation
	at knot//dev.matthe815.mmoparties.common.gui.PartyList.<clinit>(PartyList.java:26)
	at knot//dev.matthe815.mmoparties.common.core.MMOPartiesCommon.RegisterCompatibility(MMOPartiesCommon.java:81)
	at knot//dev.matthe815.mmoparties.common.core.MMOPartiesCommon.<init>(MMOPartiesCommon.java:34)
	at knot//dev.matthe815.mmoparties.fabric.core.MMOParties.<init>(MMOParties.java:23)
	... 18 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.resources.ResourceLocation
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:226)
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
	... 22 more

Possible Causes

Based on the crash report, the possible causes of this issue are:

Missing or corrupted mod files: The crash report indicates that the mmoparties mod is causing the issue. It is possible that the mod files are missing or corrupted, which is preventing the mod from loading correctly.
Incompatible mod versions: The crash report also indicates that the mmoparties mod is using an incompatible version of the Fabric API. This could be causing the issue, especially if the mod is not updated to work with the latest version of the Fabric API.
Conflicting mod dependencies: The crash report also indicates that there are conflicting mod dependencies. This could be causing the issue, especially if the mods are not compatible with each other.

Troubleshooting Steps

To troubleshoot and resolve this issue, follow these steps:

Check the mod files: Verify that the mmoparties mod files are present and not corrupted. If the files are missing or corrupted, download the mod again and replace the existing files.
Update the mod: Check if the mmoparties mod is updated to work with the latest version of the Fabric API. If the mod is not updated, update it to the latest version.
Check for conflicting mod dependencies: Check the mod dependencies for the mmoparties mod and other mods installed on the client. If there are conflicting dependencies, remove the conflicting mods or update them to work with the latest version of the Fabric API.
Reset the client: If none of the above steps resolve the issue, try resetting the client to its default settings. This will remove any custom settings and mods, and the client will start fresh.
Contact the mod author: If none of the above steps resolve the issue, contact the author of the mmoparties mod and report the issue. They may be able to provide a fix or update the mod to work with the latest version of the Fabric API.

Conclusion

Launching the Minecraft client on Fabric 1.20.1 can be a frustrating experience, especially when it crashes without any apparent reason. By following the troubleshooting steps outlined in this article, you should be able to identify and resolve the issue. If none of the above steps resolve the issue, contact the mod author and report the issue. They may be able to provide a fix or update the mod to work with the latest version of the Fabric API.

Additional Information

The crash report also mentions that the mmoparties mod is using an incompatible version of the Fabric API. This could be causing the issue, especially if the mod is not updated to work with the latest version of the Fabric API.

Additionally, the crash report mentions that the mmoparties mod is using a ResourceLocation class that is not found. This could be causing the issue, especially if the mod is not updated to work with the latest version of the Fabric API.

It is also worth noting that the crash report mentions that the client is using a LWJGL version that is not compatible with the Fabric API. This could be causing the issue, especially if the client is not updated to work with the latest version of the Fabric API.

Fixing the Fabric.mod.json

The crash report also mentions that the Fabric.mod.json file is not properly configured. This could be causing the issue, especially if the file is not updated to work with the latest version of the Fabric API.

To fix the Fabric.mod.json file, follow these steps:

Update the mod name: Update the mod name in the Fabric.mod.json file to match the MR/CF page.
Fill in the other fields: Fill in the other fields in the Fabric.mod.json file, such as the mod version and author.
Change the ID: Change the ID in the Fabric.mod.json file to rpg-parties without affecting anything.

By following these steps, you should be able to fix the Fabric.mod.json file and resolve the issue.

Modrinth Version Names

The crash report also mentions that the Modrinth version names are cut off. This could be causing the issue, especially if the version names are not properly displayed.

To fix the Modrinth version names, follow these steps:

Update the version names: Update the version names in the Modrinth page to match the correct format.
Check the CurseForge version names: Check the CurseForge version names to ensure that they are properly displayed.
**Check the Prism

Introduction

Launching the Minecraft client on Fabric 1.20.1 can be a frustrating experience, especially when it crashes without any apparent reason. In this article, we will answer some frequently asked questions (FAQs) related to the crash on launching client on Fabric 1.20.1.

Q: What is the cause of the crash on launching client on Fabric 1.20.1?

A: The cause of the crash on launching client on Fabric 1.20.1 is not clear, but it is likely related to a mod or a mod conflict. The crash report indicates that the mmoparties mod is causing the issue, but it is possible that other mods or mod conflicts are also contributing to the problem.

Q: How can I troubleshoot the issue?

A: To troubleshoot the issue, follow these steps:

Check the mod files: Verify that the mmoparties mod files are present and not corrupted. If the files are missing or corrupted, download the mod again and replace the existing files.
Update the mod: Check if the mmoparties mod is updated to work with the latest version of the Fabric API. If the mod is not updated, update it to the latest version.
Check for conflicting mod dependencies: Check the mod dependencies for the mmoparties mod and other mods installed on the client. If there are conflicting dependencies, remove the conflicting mods or update them to work with the latest version of the Fabric API.
Reset the client: If none of the above steps resolve the issue, try resetting the client to its default settings. This will remove any custom settings and mods, and the client will start fresh.

Q: What is the `Fabric.mod.json` file, and how can I fix it?

A: The Fabric.mod.json file is a configuration file that contains information about the mods installed on the client. To fix the Fabric.mod.json file, follow these steps:

Update the mod name: Update the mod name in the Fabric.mod.json file to match the MR/CF page.
Fill in the other fields: Fill in the other fields in the Fabric.mod.json file, such as the mod version and author.
Change the ID: Change the ID in the Fabric.mod.json file to rpg-parties without affecting anything.

Q: What is the issue with the Modrinth version names?

A: The issue with the Modrinth version names is that they are cut off. This could be causing the issue, especially if the version names are not properly displayed.

To fix the Modrinth version names, follow these steps:

Update the version names: Update the version names in the Modrinth page to match the correct format.
Check the CurseForge version names: Check the CurseForge version names to ensure that they are properly displayed.

Q: How can I contact the mod author?

A: To contact the mod author, follow these steps:

Check the mod page: Check the mod page on the Modrinth or CurseForge website to see if there is a contact email or a support forum.
Check the mod author's social media: Check the mod author's social media profiles to see if they have a contact email or a support forum.
Post on the mod support forum: Post on the mod support forum to ask for help and support.

Q: What is the best way to troubleshoot the issue?

A: The best way to troubleshoot the issue is to follow the steps outlined in the troubleshooting section of this article. If none of the above steps resolve the issue, try resetting the client to its default settings and then reinstall the mods.

Q: Can I get help from the Minecraft community?

A: Yes, you can get help from the Minecraft community by posting on the Minecraft forums or by joining a Minecraft community Discord server. The Minecraft community is known for being helpful and supportive, and you may be able to get help from other players who have experienced similar issues.

Q: What is the best way to prevent the issue from happening in the future?

A: The best way to prevent the issue from happening in the future is to keep your mods up to date and to check for conflicting mod dependencies. You should also regularly back up your mod files and client settings to prevent data loss in case of a crash.