Warning: require_once(mainfile.php) [function.require-once]: failed to open stream: No such file or directory in C:\Inetpub\vhosts\ulife.in.th\httpdocs\index.php on line 3

Fatal error: require_once() [function.require]: Failed opening required 'mainfile.php' (include_path='.;./includes;./pear') in C:\Inetpub\vhosts\ulife.in.th\httpdocs\index.php on line 3