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