rosrun fails on Qt binding

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I get a similar error:

I have Linux Ubuntu 14.04 and ROS Indigo. I have qt, PyQt and PySide and I get a similar error: ```

$ rosrun rqt_gui rqt_gui --qt-binding=pyside Traceback (most recent call last): File "/opt/ros/indigo/lib/rqt_gui/rqt_gui", line 13, in <module> sys.exit(main.main()) File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_gui/main.py", line 59, in main return super(Main, self).main(argv, standalone=standalone, plugin_argument_provider=plugin_argument_provider, plugin_manager_settings_prefix=str(hash(os.environ['ROS_PACKAGE_PATH']))) File "/opt/ros/indigo/lib/python2.7/dist-packages/qt_gui/main.py", line 336, in main from python_qt_binding import QT_BINDING File "/opt/ros/indigo/lib/python2.7/dist-packages/python_qt_binding/__init__.py", line 55, in <module> from .binding_helper import loadUi, QT_BINDING, QT_BINDING_MODULES, QT_BINDING_VERSION # @UnusedImport File "/opt/ros/indigo/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 262, in <module> getattr(sys, 'SELECT_QT_BINDING_ORDER', None), File "/opt/ros/indigo/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 90, in _select_qt_binding raise ImportError("Could not find Qt binding (looked for: %s):\n%s" % (', '.join(["'%s'" % b for b in binding_order]), '\n'.join(error_msgs))) ImportError: Could not find Qt binding (looked for: 'pyside'): ImportError for 'pyside': /usr/lib/python2.7/dist-packages/PySide/QtCore.so: undefined symbol: _ZNK7QObject17senderSignalIndexEv ```

My guess is that the python path may have a problem. But I am not sure how to solve this...