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It would always help if you include the following in your original post:

env | grep ROS
env | grep PYTHON

And Google returns a number of results on ros.org about "ImportError: No module named" errors, many of which were that PYTHONPATH didn't include the path your module is located at. Make sure you source the right setup.bash file. Also cleaning your workspace (by removing build and devel, and rebuild by catkin) might help.

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