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I'm guessing here, but I suspect you're on step 15 from those instructions.

It can't find the catkin ptyhon library, so my first guess would be that your PYTHONPATH isn't set properly.

I would check that your PYTHONPATH isn't set, and then you can try sourcing your bashrc or starting a new shell and confirming that it's set properly. (Step 14 should set up your PYTHONPATH for new shells, but won't affect existing shells).

If that works, you should probably contact the tutorial's author and ask them to update it and/or repost it on the ROS wiki.