Failed bind to port Debian 5.0

Hello, when i want in linux start the server, i have this error:

Code:

2011-07-01 13:16:15 [INFO] Starting minecraft server version Beta 1.7_01
2011-07-01 13:16:15 [INFO] Loading properties
2011-07-01 13:16:15 [INFO] Starting Minecraft server on 91.224.92.55:25565
2011-07-01 13:16:15 [WARNING] **** FAILED TO BIND TO PORT!
2011-07-01 13:16:15 [WARNING] The exception was: java.net.BindException: Cannot assign requested address
2011-07-01 13:16:15 [WARNING] Perhaps a server is already running on that port?
2011-07-01 13:16:16 [SEVERE] java.lang.NullPointerException
   at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:480)
   at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:367)
   at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

How to fix it? I'm using Linux on Debian 5.0

Thank for help in advance!

 

Make this:
top
(than look für the ID from Java)
press [K]
then the ID from Java
and then [Return]