HTTP Web Server: Illegal Arguments Exception

I have a case where the user is trying to enter a delegated mail via inotes V8 to a database V6 and she gets the error HTTP Web Server: Illegal Arguments Exception

serching i found that the error shows when default and anonymouse access is cheked whit read and write public documents. But in this case those are not cheked and the user have the rights ok in the acl.

default and anonymous is whith no access and only is cheker replicate or copy documents.

Any idea?