ValueError: Unknown projection '3d'

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ValueError: Unknown projection '3d'

我刚刚安装了matplotlib，并试图运行他们的一个示例脚本。然而，我遇到了下面详细说明的错误。我做错了什么？

错误是：

Traceback (most recent call last):

File "", line 245, in run_nodebug

File "", line 5, in

File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 945, in gca

return self.add_subplot(111, **kwargs)

File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 677, in add_subplot

projection_class = get_projection_class(projection)

File "C:\Python26\lib\site-packages\matplotlib\projections\__init__.py", line 61, in get_projection_class

raise ValueError("Unknown projection '%s'" % projection)

ValueError: Unknown projection '3d'

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