i don`t do nomething and ...

Warning: Failed opening '/var/www/lug/htdocs/include/common.php' for inclusion (include_path='.:/usr/share/pear') in /mnt/hard2/www/lug/htdocs/vechi/mainfile.php on line 72

Warning: Failed opening '/var/www/lug/htdocs/class/xoopsblock.php' for inclusion (include_path='.:/usr/share/pear') in /mnt/hard2/www/lug/htdocs/vechi/header.php on line 28

Fatal error: Failed opening required '/var/www/lug/htdocs/class/template.php' (include_path='.:/usr/share/pear') in /mnt/hard2/www/lug/htdocs/vechi/header.php on line 62

don`t whant to work .. what to do ?

Your mainfile.php holds the wrong value for your server physical path.

You need to add a /vechi after the /mnt/hard2/www... part

tnx much