Apache2 error

[scoutsniper]

Hi i have this error and i can't open an a admin.domain.tld only the domain domain.tld the error is this : Starting web server (apache2)...apache2: apr_sockaddr_info_get() failed for i1
apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
httpd (pid 18461) already running

Every time when i install ispCP i have this error PLS tell me how to fix it.