But I still have the same problem. Where exactly are those files supposed to be located in debian 5 installation? Can I find them in the install.tar.gz file and simply put them in place?
This is the warning that appears at the top of the page:
Warning: listform::include(lib/lang/en_web_domain_admin_list.lng)[listform.include]: failed to open stream: No such file or directory in /usr/local/ispconfig/interface/lib/classes/listform.inc.php on line 63
Warning: listform::include() [function.include]: Failed opening 'lib/lang/en_web_domain_admin_list.lng' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /usr/local/ispconfig/interface/lib/classes/listform.inc.php on line 63