I was trying to launch my 1.21 server and it returned this error

[18:17:22] [ERROR] [FabricLoader/]: Uncaught exception in thread "main"
java.lang.RuntimeException: An exception occurred when launching the server!
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:71)
Caused by: java.lang.RuntimeException: Error invoking MC server bundler: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor.process(BundlerProcessor.java:102)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.locateGame(MinecraftGameProvider.java:192)
at net.fabricmc.loader.impl.launch.knot.Knot.createGameProvider(Knot.java:175)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:130)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23)
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69)
Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:879)
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor$1.loadClass(BundlerProcessor.java:65)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:467)
at net.fabricmc.loader.impl.game.minecraft.BundlerProcessor.process(BundlerProcessor.java:85)
... 6 more

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0

you are using the wrong java version. 1.21 requires java 21. This is not a fabric api issue

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/bundler/Main has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0

you are using the wrong java version. 1.21 requires java 21. This is not a fabric api issue

I have tryed every version including 21 and they all still don't work

then you are doing it wrong. the issue tracker is not meant for getting assistance with your computer setup. please use the discord or the discussions tab. This is not a Fabric API mod issue.

👋 We use the issue tracker exclusively for final bug reports and feature requests. However, this issue appears to be better suited for either a discussion thread, or a message on our discord server. Please post your request on one of these, and the conversation can continue there.