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Habe ein Problem...

Wollte mit einem meiner Freunde einen Server mit Mods eröffnen um zusammen zu spielen doch jetzt ist diese Meldung da : , Weiß nicht weiter, kann mir da jemand helfen?

 

[13:07:30] [main/ERROR] [LaunchWrapper]: Unable to launch>
java.lang.ClassNotFoundException: net.minecraft.server.MinecraftServer
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_212]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_212]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_212]
	at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_212]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70) [server.jar:?]
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) [server.jar:?]
Caused by: java.lang.ClassFormatError: Duplicate interface name "xaero/common/server/IMinecraftServer" in class file net/minecraft/server/MinecraftServer
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_212]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[?:1.8.0_212]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_212]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ~[launchwrapper-1.12.jar:?]
	... 12 more  

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