ImportError: dlopen(/Applications/sage/local/lib/python2.7/lib-dynload/operator.so, 2): Symbol not found: __PyUnicodeUCS4_AsDefaultEncodedString Referenced from: /Applications/sage/local/lib/python2.7/lib-dynload/operator.so Expected in: flat namespace in /Applications/sage/local/lib/python2.7/lib-dynload/operator.so logout