soundcenter error

[19:29:53] [Server thread/INFO]: Starting minecraft server version 1.7.2
[19:29:53] [Server thread/INFO]: Loading properties
[19:29:53] [Server thread/INFO]: Default game type: SURVIVAL
[19:29:53] [Server thread/INFO]: Generating keypair
[19:29:54] [Server thread/INFO]: Starting Minecraft server on minecraftlords.zapto.org:25565
[19:29:54] [Server thread/WARN]: **** FAILED TO BIND TO PORT!
[19:29:54] [Server thread/WARN]: The exception was: java.net.BindException: Cannot assign requested address: bind
[19:29:54] [Server thread/WARN]: Perhaps a server is already running on that port?
[19:30:46] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
	at net.minecraft.server.v1_7_R1.DedicatedServer.aw(DedicatedServer.java:282) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
	at net.minecraft.server.v1_7_R1.DedicatedServer.a(DedicatedServer.java:228) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:465) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
[19:30:46] [Server thread/ERROR]: This crash report has been saved to: C:\Users\Minecraft\Dropbox\Minecraft\Minecraft Server\.\crash-reports\crash-2014-01-30_19.30.46-server.txt
[19:30:51] [Server thread/INFO]: Stopping server
[19:30:51] [Server thread/INFO]: Saving worlds
[19:30:51] [Thread-4/INFO]: Stopping server
[19:30:51] [Thread-4/INFO]: Saving worlds