One of m students is having a problem with his tool box. Whenyou try to insert the washer into the counter weight it brings uperror which says "the toolbox part file c:\\program files\\commonfiles\\solidworks data\\browser\\ansi inch\\washers\\flat washer type Anarrow_ai.sldprt is currently being modified by another user.please try again in a few moments" Any ideas what might be theproblem.SolidworksGeneral