>I have a VCX that contains several classes. One class (Class A) is used as a child class on another class (Class B).
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>Say Class A is a grid subclass and Class B is a form containing the grid. I go to the Class Browser and open Class B and the close it. Then I open Class A and I get this fatal error. If I open Class A without previously opening Class B I have no problems.
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>Does anybody know what migh be causing this and how I can make this error stop?

If VFP6, do you have SP3 installed?