It is found that the default recursion depth of Python is very limited (the default is 1000), so when the recursion depth exceeds 999, such an exception will be thrown.

Solution:

You can modify the value of recursion depth to make it larger

import sys

Sys.setrecursionlimit (100000) # for example, it is set to 100000 here

be careful:

This solution is not the root cause, but also needs to be optimized in the code.