我卸载了matplotlib，但是现在无论我尝试在我的终端上运行什么命令，无论是否与matplotlib相关，我都会收到以下消息。我该如何解决？
错误处理/anaconda3/lib/python3.6/site-packages/matplotlib-2.2.2-py3.6-nspkg.pth的第1行：
Traceback (most recent call last):
File "/anaconda3/lib/python3.6/site.py", line 168, in addpackage
exec(line)
File "<string>", line 1, in <module>
File "<frozen importlib._bootstrap>", line 568, in module_from_spec
AttributeError: 'NoneType' object has no attribute 'loader'