URGENT! HELP

I went to whatsmyip.org and ipchicken.com, they both give me the same IP so I pu tit in the server prop files and when I run the server it says:
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10:53:35 [INFO] Starting minecraft server version 1.2.5
10:53:35 [INFO] Loading properties
10:53:35 [INFO] Starting Minecraft server on 66.74.128.65:25565
10:53:35 [WARNING] **** FAILED TO BIND TO PORT!
10:53:35 [WARNING] The exception was: java.net.BindException: Cannot assign requ
ested address: JVM_Bind
10:53:35 [WARNING] Perhaps a server is already running on that port?
>


Can anyone please help me?! Really urgent!

You do not need to put your ip in serverprop.txt you leave it blank so people can connect.Leave it blank,run it and open mc.then click direct connect and type "localhost" and connect