getting this error when starting sun server 9.1

[Debasis Sahoo]

Starting Domain domain1, please wait.
Log redirected to C:\Sun\AppServer\domains\domain1\logs\server.log.
Redirecting output to C:/Sun/AppServer/domains/domain1/logs/server.log
Domain domain1 failed to startup. There is a conflict on port 8080. Please check
the server log for more details.
CLI156 Could not start the domain domain1.
Press any key to continue . . .