squid hung up

I have install squid from SuSE 8.1 rpm but every time that i am trying to run it after 2-3 seconds the deamon hung up and i can see the following error in my messages log file: Jun 17 16:27:37 squid[29909]: Using Least Load store dir selection Jun 17 16:27:37 squid[29909]: Set Current Directory to /var/cache/squid Jun 17 16:27:37 squid[29909]: Loaded Icons. Jun 17 16:27:37 squid[29909]: commBind: Cannot bind socket FD 11 to 172.16.15.201:80: (98) Address already in use Jun 17 16:27:37 squid[29909]: Cannot open HTTP Port Jun 17 16:27:37 squid[29891]: Squid Parent: child process 29909 exited due to signal 6 Jun 17 16:27:37 squid[29891]: Exiting due to repeated, frequent failures Any suggestions?