почему серв не запускается ???пишет такое

[INFO] Starting minecraft server version 1.4.5
[INFO] Loading properties
[INFO] Default game type: SURVIVAL
[INFO] Generating keypair
[INFO] Starting Minecraft server on 46.21.251.155:25565
[WARNING] **** FAILED TO BIND TO PORT!
[WARNING] The exception was: java.net.BindException: Cannot assign requested address: JVM_Bind
[WARNING] Perhaps a server is already running on that port?
[INFO] Unknown command. Try /help for a list of commands.
[INFO] Unknown command. Try /help for a list of commands.

Это Minecraft