When I create an object from a class, I get the following error:

Error loading file - record number 170
Pg1 <or one of its members>. Parent: Cannot add PG1. Class definition is cyclical.

What does this mean? I have never seen this error before.

I can open the offending class in the class designer. Make changes etc.

But when I try to create the object from this class...



The above error appears.

I just spent 2 hours creating this base form class, with a pageframe on it and numerous controls on each of the pages.

Any ideas?
Mike