Hello,

today me and another friend tried to install LuckPerms on bungeecord.

21:59:31 [WARNING] Error enabling plugin LuckPerms java.lang.NoClassDefFoundError: org/bukkit/plugin/java/JavaPlugin at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:34) at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:27) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at net.md_5.bungee.api.plugin.PluginManager.enablePlugin(PluginManager.java:304) at net.md_5.bungee.api.plugin.PluginManager.loadPlugins(PluginManager.java:212) at net.md_5.bungee.BungeeCord.start(BungeeCord.java:267) at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:56) at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.kroseida.launcher.Launcher.startServer(Launcher.java:104) at com.kroseida.launcher.Launcher.<init>(Launcher.java:37) at com.kroseida.launcher.Launcher.main(Launcher.java:22) Caused by: java.lang.ClassNotFoundException: org.bukkit.plugin.java.JavaPlugin at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:53) at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:27) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 25 more

This was the result. We werent able to figure out where the issue comes from.
Using the latest version of bungeecord, all the requirements were met, including the things shown in the network installation wiki.

Please help.

Greetings

You should try to use the Bungee version instead of the Bukkit/Spigot version. I mean there's a reason the file is called LuckPerms-Bukkit-4.x.x.jar

Third sentence on the wiki links you directly to the downloads.

I am using the bungeecord-version. Thats the point.

You're not - you've installed the Bukkit version of LuckPerms to your proxy plugins folder.

You need to use the BungeeCord version instead.
https://luckperms.github.io/