You Reverted your Code back

You successfully reverted back to your the tagged branch you were working off of and the error still stands. You have no leads.

ERROR: Traceback line(942) RunTest()
Line(633) StepAlgorithm()
Line(912) ReInitParams()
Line(220) Calc_AGP_F_OLD()
NaN Value found in Attribute Error in Non-Zero Reference de-allocated in name 

What do you do?

1. Google the Error
2. Look through the code line by line
3. Strategically add a bunch of debug logging print statements
4. Ask the guy who wrote the code
5. Try running the code again