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Hi, I've installed the app (4.7.2) on my Mac (OS 10.6.8). When I launch the app I have the following error. Could someone provide me a simple fix please? (I'm really not fluent with the Unix commands...).

Thank you in advance.

Here is what have in the Terminal console:

Sage Version 4.7.2, Release Date: 2011-10-29                       
Type notebook() for the GUI, and license() for information.    


Traceback (most recent call last):
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage//local/bin/sage-ipython", line 18, in <module>
    import IPython
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/site-packages/IPython/__init__.py", line 58, in <module>
    __import__(name,glob,loc,[])
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/site-packages/IPython/ipstruct.py", line 17, in <module>
    from IPython.genutils import list2dict2
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/site-packages/IPython/genutils.py", line 26, in <module>
    import shlex
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python/shlex.py", line 12, in <module>
    from collections import deque
  File "/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python/collections.py", line 9, in <module>
    from operator import itemgetter as _itemgetter
ImportError: dlopen(/Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/lib-dynload/operator.so, 2): Symbol not found: __PyUnicodeUCS4_AsDefaultEncodedString
  Referenced from: /Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/lib-dynload/operator.so
  Expected in: flat namespace
 in /Applications/Sage-4.7.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/lib-dynload/operator.so