[Python] mpl FileNotFoundError: [WinError 2] The system cannot find the file specified

import pandas as pd
import numpy as np
import math
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1.inset_locator import (inset_axes,InsetPosition,mark_inset)


when I run the code, the following error happens

FileNotFoundError: [WinError 2] The system cannot find the file specified. 'c:\\Program\\circumstance\\Python3.9\\lib\\site-packages\\matplotlib.libs.'


In fact, when I first run the code, there is no error. To solve the problem, I checked my Python file folder. It already has the mpl_toolkits folder. So I tried to pip uninstall matplotlib and mpl_toolkits and pip install them again. Unluckily, it makes nothing.

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