I have an error I do not understand at all...

[PikachuLuke5]

I am using Modrinth and it crashed with the following report:
---- Minecraft Crash Report ----
// Uh... Did I do that?
Time: 2024-12-26 18:09:34
Description: Initializing game
java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'videoplayer' at 'com.github.NGoedix.videoplayer.VideoPlayer'!
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
at knot//net.minecraft.class_310.(class_310.java:458)
at knot//net.minecraft.client.main.Main.main(Main.java:211)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/itemgroup/v1/FabricItemGroup
at knot//com.github.NGoedix.videoplayer.VideoPlayer.(VideoPlayer.java:22)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:467)
at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:50)
at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124)
at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399)
... 6 more
Caused by: java.lang.ClassNotFoundException: net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroup
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)
... 13 more
A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
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.(class_310.java:458)
-- Initialization --
Details:
Modules:
ADVAPI32.dll:Advanced Windows 32 Base API:10.0.26100.1 (WinBuild.160101.0800):Microsoft Corporation
COMCTL32.dll:User Experience Controls Library:6.10 (WinBuild.160101.0800):Microsoft Corporation
GDI32.dll:GDI Client DLL:10.0.26100.2033 (WinBuild.160101.0800):Microsoft Corporation
IMM32.DLL:Multi-User Windows IMM32 API Client DLL:10.0.26100.1150 (WinBuild.160101.0800):Microsoft Corporation

[Thexiaoyu]

Hey, your game crashed. It's awful because I ran into this same issue too. But after some research, I found that the Fabric API updated its API for version 1.20.4, causing that mod to malfunction.