My system often crashes and I get the error message, "An error of type 1 has occured." when using Chem3D.
If you are using a 68040 machine like a Centris or a Quadra, you must make sure 32-bit addressing is ON. To turn 32-bit addressing on, go to the Apple menu and choose Control Panels. From the Control Panels, choose Memory. Turn 32-bit addressing ON and restart your computer.