Python Programming. Binary Search Tree [BST]. In this program, we try to implement a BST and there are tests on the bottom that we using to test the code. And I am stuck with add, Inorder, postorder, preorder, BFS. I keep getting errors when i run the program or try to test it on Pycharm. Its a Intro to Python 3 course.

here is my code >> https://docs.google.com/document/d/1uJAjGs79ePe6iZkiUgsu5Mx4CukGrS7AK4Vl20ckIeI/edit?usp=sharing