Minecraft Server geht nicht?

Hallo.

Ich habe gestern auf meinem V Server Multicraft installiert, und jetzt wollte ich einen Server installieren. Es kam dann aber nur diese Fehlermeldung:

03.01 10:52:26[Multicraft] Received start command
03.01 10:52:26[Multicraft] Loading server properties
03.01 10:52:26[Multicraft] Starting server!
03.01 10:52:26[Multicraft] Loaded config for "Default Minecraft Server"
03.01 10:52:26[Server]INFO Exception in thread "main" java.lang.UnsupportedClassVersionError: net/minecraftforge/fml/relauncher/ServerLaunchWrapper : Unsupported major.minor version 52.0
03.01 10:52:26[Server]INFO at java.lang.ClassLoader.defineClass1(Native Method)
03.01 10:52:26[Server]INFO at java.lang.ClassLoader.defineClass(ClassLoader.java:808)
03.01 10:52:26[Server]INFO at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
03.01 10:52:26[Server]INFO at java.net.URLClassLoader.defineClass(URLClassLoader.java:443)
03.01 10:52:26[Server]INFO at java.net.URLClassLoader.access$100(URLClassLoader.java:65)
03.01 10:52:26[Server]INFO at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
03.01 10:52:26[Server]INFO at java.net.URLClassLoader$1.run(URLClassLoader.java:349)
03.01 10:52:26[Server]INFO at java.security.AccessController.doPrivileged(Native Method)
03.01 10:52:26[Server]INFO at java.net.URLClassLoader.findClass(URLClassLoader.java:348)
03.01 10:52:26[Server]INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:430)
03.01 10:52:26[Server]INFO at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:326)
03.01 10:52:26[Server]INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
03.01 10:52:26[Server]INFO at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
03.01 10:52:26[Multicraft] Server shut down (starting)
03.01 10:52:26[Multicraft] Restarting crashed server in 5 seconds
03.01 10:52:26[Multicraft] Stopping server!
03.01 10:52:28[Multicraft] Looks like a crash, check the server console. Return value: 1
03.01 10:52:28[Multicraft] Server stopped

Was muss ich machen dass ich den Server starten kann? Ich möchte Forge 1.12.2 drauf installieren.

PC, Server, Computer, Internet, Software, Fehler, Linux, Programm, IT, Java, Minecraft, EDV, Minecraft Server, Fehlermeldung, Debian, Multicraft

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