Well, i've been using your XOOPS system for months. It's a news site. Now, one fine morning, when i was about to submit news, i see this message:
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Warning: main(): open_basedir restriction in effect. File(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/include/common.php) is not within the allowed path(s): (/users/navinpcfreak.com) in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/mainfile.php on line 72

Warning: main(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/include/common.php): failed to open stream: Operation not permitted in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/mainfile.php on line 72

Warning: main(): Failed opening '/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/include/common.php' for inclusion (include_path='.:') in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/mainfile.php on line 72

Warning: main(): open_basedir restriction in effect. File(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/xoopsblock.php) is not within the allowed path(s): (/users/navinpcfreak.com) in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 28

Warning: main(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/xoopsblock.php): failed to open stream: Operation not permitted in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 28

Warning: main(): Failed opening '/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/xoopsblock.php' for inclusion (include_path='.:') in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 28

Warning: main(): open_basedir restriction in effect. File(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/template.php) is not within the allowed path(s): (/users/navinpcfreak.com) in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 62

Warning: main(/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/template.php): failed to open stream: Operation not permitted in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 62

Fatal error: main(): Failed opening required '/home/usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/class/template.php' (include_path='.:') in /usr/local/share/doc/vhost/navinpcfreak.com/httpdocs/xoop/header.php on line 62
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i summon all those experts, who can solve my problem. Please help me on this particular section. I'm ruined. I tried to replace the mainfile.php but didn't help.

Sinerely
Navin

This is not the problem of xoops, but the server configuration. Or perhaps you need to upload the files to a different directory (somewhere under /users/navinpcfreak.com?). You should ask the server admin to fix this.