ImportError soundtouch.so: no suitable image found

[thisisjl]

Hi, I need to change the tempo of a song for a project and I would like to use remix. When I run, for example, the following command file:
python beatshift.py "01 - I Saw Her Standing There.mp3" out.mp3

I get this error:

Traceback (most recent call last): File "beatshift.py", line 19, in <module> from echonest.remix import audio, modify File "build/bdist.macosx-10.6-x86_64/egg/echonest/remix/modify.py", line 11, in <module> File "build/bdist.macosx-10.6-x86_64/egg/soundtouch.py", line 7, in <module> File "build/bdist.macosx-10.6-x86_64/egg/soundtouch.py", line 6, in __bootstrap__ ImportError: dlopen(/Users/JL/.python-eggs/remix-2.4.0-py2.7-macosx-10.6-x86_64.egg-tmp/soundtouch.so, 2): no suitable image found. Did find: /Users/JL/.python-eggs/remix-2.4.0-py2.7-macosx-10.6-x86_64.egg-tmp/soundtouch.so: mach-o, but wrong architecture

Do you know what can I do to solve it?
Thanks