I had the same issue earlier this week but with just a different code. Why do I keep getting this error or similar when I try save and how to I resolve it?
'Results of Validity Check.
*** Problems were found that could not be fixed! ***
The entity at address 12dedf0 has an invalid id (0) destroyed (0)’
Evidently you have some bad geometry. Probably vertices too close together. Under Preferences>General untick Automatically check models. Then save the file and upload it here. We can help you discern where the problem lies.
That worked perfectly. The file is too big to attach and I do not yet have a cloud backup of it. Is there anything I can do to check if their is this ‘geometry issue’.
The file still has a lot of work to be done so for future reference.