Problem with URL for submissions


we have a problem with the submissions.
When we choose a Reviewer the URL in the Email gives a 404.
The text is
" Not Found
The requested URL /index.php /atp_edition/reviewer/submission was not found on this server."

We have this problem since a week. Before that everything worked fine. It is not the only Submission with this problem. Our other articles we submitted yesterday have the same problem.

Can you help?
Thank you very much