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Has anyone seen this message? It occurs on the activate on the form, line :

lnpage=thisform.pgfbizobj.activepage

I know this object exists. I compare it to another form that works and I can't see any differences. Any ideas?
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Could it be possible that there is an object missing. Maybe you should be referencing another object like so:

lnpage=thisform.SOMEOTHEROBJECT.pgfbizobj.activepage