Server start nicht Möglich

[22:54:54] [Server thread/INFO]: Starting minecraft server version 1.7.2
[22:54:54] [Server thread/INFO]: Loading properties
[22:54:54] [Server thread/INFO]: Default game type: CREATIVE
[22:54:54] [Server thread/INFO]: Generating keypair
[22:54:54] [Server thread/INFO]: Starting [lexicon]Minecraft[/lexicon] server on *:25565
[22:54:54] [Server thread/WARN]: **** FAILED TO BIND TO PORT!
[22:54:54] [Server thread/WARN]: The exception was: java.net.BindException: Address already in use
[22:54:54] [Server thread/WARN]: Perhaps a server is already running on that port?
[22:55:40] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
at net.minecraft.server.v1_7_R1.DedicatedServer.aw(DedicatedServer.java:282) ~inecraft_server.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.a(DedicatedServer.java:228) ~inecraft_server.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:465)inecraft_server.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)inecraft_server.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]