I have an assembly file with four parts(All are drawn by solidworks 2014)

and I save the assembly file to igs with the same solidworks 2014.

But I can't open the igs file with the same solidworks 2014.

It says 'Solidworks 2014 has encountered a problem and needs to close'

It keeps crashing......

SYSTEM:

HP Z230 Tower Workstation

Windows 7 Professional Service Pack 1 64 bit

Intel(R) Xeon(R) CPU E3-1270 v3 @3.5GHZ 3.5GHZ

RAM: 16GB