Fix osCommerce Error

I need somebody to fix a oscommerce error. We moved to a new server, since then there are several problems in the admin. I think this is because the newer PHP version or a wrong admin path. Problems like: After edit/add a product: Warning: Invalid argument supplied for foreach() in /home/*/domains/*.nl/public_html/iadmin/includes/functions/[login to view URL] on line 1198 Warning: Invalid argument supplied for foreach() in /home/*/domains/*.nl/public_html/iadmin/includes/functions/[login to view URL] on line 1198 Warning: Cannot modify header information - headers already sent by (output started at /home/*/domains/*.nl/public_html/iadmin/includes/functions/[login to view URL]) in /home/*/domains/*.nl/public_html/iadmin/includes/functions/[login to view URL] on line 120 Open seo page: Warning: opendir(/domains/*.nl/public_html/) [[login to view URL]]: failed to open dir: No such file or directory in /home/*/domains/*.nl/public_html/iadmin/includes/functions/[login to view URL] on line 16 Failed to open dir * = domain name