Control panel shows my web site address but when I try to log into it, it gives me the following error message.

Fatal error: Cannot redeclare bw_get_uid() (previously declared in /var/wkscript/common.php:522) in /var/wkscript/common.php on line 694

Also can't get into the web address via internet either. Just get page load error.

How can I get this fixed please?