Program Error (Server Error 500)

More information about this error may be available in the server error log and/or program error log.

Dada Mail 3.0.3 Stable error, please MAKE SURE that '/mnt/www/newsletter_liste/liste_newsletter' is a directory (NOT a file) and that Dada Mail has enough permissions to write into this directory: No such file or directory at DADA/App/ line 908