Anaconda运行时错误：未将Python安装为框架吗？

我已经使用pkg安装程序安装了Anaconda：

Python 2.7.10 |Continuum Analytics, Inc.| (default, May 28 2015, 17:04:42) 
[GCC 4.2.1 (Apple Inc. build 5577)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Anaconda is brought to you by Continuum Analytics.
Please check out: http://continuum.io/thanks and https://binstar.org

但是当我尝试使用matplotlib中的任何东西时，即：

from matplotlib import pyplot as plt 我懂了

RuntimeError: Python is not installed as a framework.
The Mac OS X backend will not be able to function correctly if Python is not installed 
as a framework. See the Python documentation for more information on installing Python 
as a framework on Mac OS X. Please either reinstall Python as a framework,
or try one of the other backends.

我真的不确定这意味着什么，或者如何解决它。