Hello, I have a question regarding the model builder in arc pro. I am trying to add a field to a layer called "length". My model runs all the way up until my "calculate geometric attributes section". When it reaches here, the model fails to run and it says value is not a part of the given list. As such, I change the value to be something in the list and run the model again. However, when I run the model again, it gives me a new error message with a new list that says my new value is not within the new list. More simply, the error message changes between the two options and the two available length calculations. Does anyone know what the issue might be?
Attached are photos of the error messages:

When I run with perimeter length, it gives me the above message. When I run with length geodesic, instead of giving error message, it just turns the model grey after the requested action of calculating length.

Any suggestions would be super appreciated, thank you!