Cannot open database secondnames.nsf

We are running Domino 8.5.1 and clients are 8.5.1 as well.When a user tries to schedule a new meeting and clicks on “Find Rooms” or “Find Resources” button they would get the following error message. “User CN=username/OU=ouname cannot open database. CN=notesservername/O=servername!!secondnames.nsf”. If they click OK on this message, then it will open the “Find Rooms” dialog box and they able to search for rooms/resources.

I have tested with multiple Lotus Notes clients and it is happening for everyone.

Appreciate your advise/help.

John T.