Und wie sollen wir dir ohne Fehlermeldung weiterhelfen..?
Das ist die Fehlermeldung:
[21:44:41 ERROR]: Could not load 'plugins/ChangeName.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/Trouble/HD/alle : Unsupported major.minor version 52.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:184) ~[craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:308) ~[craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:231) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.java:255) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.reload(CraftServer.java:628) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.Bukkit.reload(Bukkit.java:279) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:196) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServer.java:542) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchServerCommand(CraftServer.java:529) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.aw(DedicatedServer.java:286) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:251) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.UnsupportedClassVersionError: me/Trouble/HD/alle : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_65]
at java.lang.ClassLoader.defineClass(ClassLoader.java:800) ~[?:1.7.0_65]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.7.0_65]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) ~[?:1.7.0_65]
at java.net.URLClassLoader.access$100(URLClassLoader.java:71) ~[?:1.7.0_65]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.7.0_65]
at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_65]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_65]
at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_65]
at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:80) ~[craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53) ~[craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_65]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_65]
at java.lang.Class.forName(Class.java:270) ~[?:1.7.0_65]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:173) ~[craftbukkit-1.7.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
... 14 more