Joomla!®Plug

Hi
I made a backup of a Joomla 1.0.15 site from a subdomain http://main.ueberwassers.ch .

I then copyied the ZIP and the three files to another subdomain on the same server: http://test15.ueberwassers.ch

All went fine, but I now get an error when starting the homepage:

Warning: mosMambotHandler::require_once(/home/www/vhosts/ueberwassers.ch/subdomains/test15/httpdocs//mambots/system/jom_commentsys_bot.php) [function.mosMambotHandler-require-once]: failed to open stream: Permission denied in /home/www/vhosts/ueberwassers.ch/subdomains/test15/httpdocs/includes/joomla.php on line 4297

Fatal error: mosMambotHandler::require_once() [function.require]: Failed opening required '/home/www/vhosts/ueberwassers.ch/subdomains/test15/httpdocs//mambots/system/jom_commentsys_bot.php' (include_path='.:.:/usr/share/pear&#039 in /home/www/vhosts/ueberwassers.ch/subdomains/test15/httpdocs/includes/joomla.php on line 4297

Can you help?

Cheers
Simone