matplotlibがimportできない

anacondaを更新してからmatplotlibがimportできなくなりました
どうすればいいですか？

python
1ImportError                               Traceback (most recent call last)
2<ipython-input-1-91c4d872923a> in <module>()
3      2 import pandas as pd
4      3 import numpy as np
5----> 4 import matplotlib.pyplot as plt
6      5 import configparser
7      6 import datetime
8
9C:\Users\tssak\Anaconda3\lib\site-packages\matplotlib\pyplot.py in <module>()
10     30 from cycler import cycler
11     31 import matplotlib
12---> 32 import matplotlib.colorbar
13     33 from matplotlib import style
14     34 from matplotlib import _pylab_helpers, interactive
15
16C:\Users\tssak\Anaconda3\lib\site-packages\matplotlib\colorbar.py in <module>()
17     30 
18     31 import matplotlib as mpl
19---> 32 import matplotlib.artist as martist
20     33 import matplotlib.cbook as cbook
21     34 import matplotlib.collections as collections
22
23C:\Users\tssak\Anaconda3\lib\site-packages\matplotlib\artist.py in <module>()
24     14 import matplotlib
25     15 from . import cbook, docstring, rcParams
26---> 16 from .path import Path
27     17 from .transforms import (Bbox, IdentityTransform, Transform, TransformedBbox,
28     18                          TransformedPatchPath, TransformedPath)
29
30C:\Users\tssak\Anaconda3\lib\site-packages\matplotlib\path.py in <module>()
31     23 import numpy as np
32     24 
33---> 25 from . import _path, rcParams
34     26 from .cbook import (_to_unmasked_float_array, simple_linear_interpolation,
35     27                     maxdict)
36
37ImportError: cannot import name _path
38