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Yes, other users have seen this before.
A quick search on this site for the title of your question turns us: http://answers.ros.org/question/257331/python-module-empy-missing-tutorials/ , http://answers.ros.org/question/239285/invoking-make-j4-l4-failed-importerror-no-module-named-em/ and http://answers.ros.org/question/228285/invoking-make-j4-l4-failed-linux-mint/ , all of which describe different causes for this error and possible solutions.