I would recommend you go through your code and look for any imperfections. What the code is saying that it is looking to reference something but there is a no object to look at.
I am out of ideas, I have reviewed the code and see nothing wrong. Since I do not have the other files to review and test I cannot tell you why.
Make sure all files are calling the correct directory. You may have some files calling the incorrect directories of their files.
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