error calculating geometry

[AnastasiaStats]

Hi,

I am trying to calculate geometry for a set of polygons and find their area. At first I was getting an error that said "Failed to apply changes after updating the row with objectID=0 with the calculated value" and it would only give me 5 areas out of 39. Then I hit start editing and tried again and this time values populate but it wont let me save them due to a row error. Any guidance is appreciated because I don't know what could be wrong with my rows. 

[DanPatterson]

Try your calculate geometry outside of your edit session.

You should run a Repair Geometry tool when you are done editing and before any calculations as well

[imansbburg]

Can anyone help me with this error? I'm on ArcPro 2.9

Traceback (most recent call last):
File "c:\arcpro\Resources\ArcToolbox\scripts\calculategeometry.py", line 276, in <module>
CalculateGeometry(fc, properties, lUnit, aUnit, cs, cformat)
File "c:\arcpro\Resources\ArcToolbox\scripts\calculategeometry.py", line 125, in CalculateGeometry
ucur.updateRow(row)
SystemError: <method 'updateRow' of 'da.UpdateCursor' objects> returned NULL without setting an error