I have an assembly which I am trying to saveas an edrawing however when I do this SW crashes with  thiserror

Runtime Error!

Program C;\ProgramFiles\Solidworks\sldworks.exe

R6025

-pure virtual function call

 

I have saved an Edrawing of another assemblyso I am thinking it may be a bad assembly, is there some criteriawhich must be met, like if I have some interference in my assemblywhich I have not ignored would this cause a crash. My computer ismore than enough to handle the program XP pro sp2, Pentium D CPU @3.2GHz 3.19 GB RAM. Thanks Paul