It seems that I have some errors in the equation of attached ESM-SB assembly.

Mouse over Equations doesn't show the error message or what is wrong.

I have three Global variables(X,Y,Z) in the assembly that are equal to the same variables in one of the parts in the same assembly.

I use this method frequently and never had an issue with it.

But this specific assembly shows this error.

Any kind of help/advice to find out what's wrong is much appreciated.