I don't know python so I get errors when I was trying to make the tower attack an incoming enemy, I was trying to do the code that detected an enemy within range, then attack those coordinates but I couldn't get it working
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It should give you the line number of the error, and what went wrong.
Copying that error and pasting it into google should give you enough info to solve the issue.
But I know I need to improve the game itself so it teaches you in stages, instead of expecting you to just know how to program in Python xD