I ran into the same issue, and after some digging, I realized it was caused by a mismatch between the DFM and CPP files. Somebady had updated the CPP file and removed some controls, but forgot to update the DFM. So the DFM was referencing objects that no longer existed in the code.

Lesson learned — and hopefully this helps someone else avoid the same headache.

By the way, this thread is older than my daughter!