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ImportError: No module named 'em', Error

asked 2017-03-23 22:59:24 -0500

tomcattiger gravatar image

Hi,

I create a test package as tutorial using

catkin_create_pkg beginner_tutorials std_msgs rospy roscpp.

When I add a custom message, it comes error

[100%] Built target beginner_tutorials_generate_messages_lisp

Traceback (most recent call last):

File "/opt/ros/kinetic/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 41, in <module>

import genmsg.template_tools

File "/opt/ros/kinetic/lib/python2.7/dist-packages/genmsg/template_tools.py", line 39, in <module>

import em

ImportError: No module named 'em'

beginner_tutorials/CMakeFiles/beginner_tutorials_generate_messages_cpp.dir/build.make:62: recipe for target '/home/arnoldx201/catkin_ws/devel/include/beginner_tutorials/Complex.h' failed

make[2]: * [/home/arnoldx201/catkin_ws/devel/include/beginner_tutorials/Complex.h] Error 1 CMakeFiles/Makefile2:1136: recipe for target 'beginner_tutorials/CMakeFiles/beginner_tutorials_generate_messages_cpp.dir/all' failed

make[1]: * [beginner_tutorials/CMakeFiles/beginner_tutorials_generate_messages_cpp.dir/all] Error 2

Makefile:138: recipe for target 'all' failed

make: * [all] Error 2

Invoking "make -j4 -l4" failed

When I use directly python --> import cm, there is no problem.

Has anyone met the same problem before? Thanks

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Hattest du eine Lösung für dein Problem gefunden?

Ich stehe momentan vor dem exakt gleichen Problem und komme nicht weiter :(

fettespferd gravatar imagefettespferd ( 2019-01-21 06:49:08 -0500 )edit

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answered 2017-03-24 00:14:07 -0500

ahendrix gravatar image

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/25733... , http://answers.ros.org/question/23928... and http://answers.ros.org/question/22828... , all of which describe different causes for this error and possible solutions.

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I had this same problem. The first link had the solution that solved it for me. I needed to install the python empy library. "pip install empy" and then "catkin_make" worked. Thanks!

mkelly66 gravatar imagemkelly66 ( 2019-07-22 22:42:02 -0500 )edit

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Asked: 2017-03-23 22:59:24 -0500

Seen: 9,763 times

Last updated: Mar 24 '17