Thanks for your reply，
Yes, I have suggested increasing or decreasing the Boolean tolerance. However, no matter how you do it, you will still get an error, and the code will run very slowly when the tolerance is relaxed to a certain extent. I found an example on Github where I reported the same error, but it was caused by a small area minus a large area causing the return value to be null. But I'm constantly cycling with boolean operations subtracting small areas from large areas, which shouldn't be his kind of problem. By the way, this error doesn't start in my code's for loop, but halfway through.
Regards,
Xiaolong Ding
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