PySide: 'QtGui.framework Library not Loaded'

antarctica

Trying to get PySide up and running

First program (From tutorial)

import sys
import PySide
from PySide import QtGui
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: dlopen(/Library/Python/2.7/site-packages/PySide/QtGui.so, 2): Library not loaded: QtGui.framework/Versions/4/QtGui
Referenced from: /Library/Python/2.7/site-packages/PySide/QtGui.so
Reason: image not found

I don't understand why is accept the 'import PySide' command but not the 'from PySide import QtGui' command...