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Look at the code on line 231 and find the variable with the null value. If you can not see what variable has the null value,
add a print statement just before line 231 that prints the values of all...

Can you add some debugging code that prints out what the code does when it executes?
Then copy that output and paste it here to show the problem.
Add some comments describing what is wrong with...

Why do you need to post a zip file?

What does the code do when it is executed? Can you post something that shows what the code currently does with comments showing what is wrong and what the desired results should be.

Please edit...