fatal error enhandled e06d7363h exception at 74dfb727h

carlson 2007
can open up all drawings but when in any of them cannot open layers. When I attempt to do this I get this error:
fatal error enhandled e06d7363h exception at 74dfb727h
can open up all drawings but when in any of them cannot open layers. When I attempt to do this I get this error:
fatal error enhandled e06d7363h exception at 74dfb727h