/cgi-system/modules.php was not found on this serv

I am getting an error message when trying to access a link thru PostNuke. The directory cgi-system is not (i dont think) a PostNuke directory and is not present in the directory listing, not in the .snapshot week.0 or week.1

"The requested URL /cgi-system/modules.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."

Is the a special Dreamhost php related directory that has become corrupted? This all started Monday morning