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Below is the relevant part of the smach code that is failing. It does not look very robust to changes in the exception. I created a ticket here. Could you post details about the ros/smach/python version you were using?

try: self._local_data._data = pickle.loads(msg.local_data) break except ImportError as ie: # This will only happen once for each package
modulename = ie.args[0][16:] packagename = modulename[0:modulename.find('.')] roslib.load_manifest(packagename)