Cannot catkinify Baxter SDK

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Hi everyone,

This is the first time I ask for a question in the Forum, I looked for this question in the search bar, but my problem didn't specifically appeared.

I'm having troubles with the Step 5 of this tutorial: Workstation Setup. In this step, it says "Install Baxter Research Robot SDK", and I'm installing the current recommended installation: 1.0 Source; with ROS Groovy, in Ubuntu 12.04.

The features of my notebook are:

-Intel® Core™ i5-4210U CPU @ 1.70GHz × 4 -3,8 GiB -Kernel Linux 3.13.0-43-generic -64-bit arquitecture processor

First, I sourced the ROS setup with

source /opt/ros/groovy/setup.bash

Then, when I try to build and install with catkin, the Terminal throws me this:

root@pablo-Latitude-3440:/home/pablo/ros_ws# catkin_make
Base path: /home/pablo/ros_ws
Source space: /home/pablo/ros_ws/src
Build space: /home/pablo/ros_ws/build
Devel space: /home/pablo/ros_ws/devel
Install space: /home/pablo/ros_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/pablo/ros_ws/build"
####
####
#### Running command: "make -j4 -l4" in "/home/pablo/ros_ws/build"
####
[  0%] [  0%] Built target geometry_msgs_generate_messages_py
[  0%] Built target std_msgs_generate_messages_py
[  0%] Built target std_msgs_generate_messages_cpp
Built target std_msgs_generate_messages_lisp
[  0%] [  0%] Built target sensor_msgs_generate_messages_py
Built target geometry_msgs_generate_messages_cpp
[  0%] [  0%] Built target sensor_msgs_generate_messages_lisp
Built target sensor_msgs_generate_messages_cpp
[  0%] Built target geometry_msgs_generate_messages_lisp
[  0%] Built target baxter_examples_gencfg
[  7%] [ 10%] Built target baxter_maintenance_msgs_generate_messages_py
Built target baxter_interface_gencfg
[ 15%] Built target baxter_maintenance_msgs_generate_messages_lisp
[ 43%] Built target baxter_core_msgs_generate_messages_py
[ 44%] [ 44%] [ 44%] Generating C++ code from baxter_maintenance_msgs/TareEnable.msg
Generating C++ code from baxter_maintenance_msgs/UpdateSource.msg
[ 70%] Generating C++ code from baxter_core_msgs/EndEffectorProperties.msg
Built target baxter_core_msgs_generate_messages_lisp
[ 71%] Generating C++ code from baxter_maintenance_msgs/CalibrateArmData.msg
Traceback (most recent call last):
  File "/opt/ros/groovy/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 41, in <module>
    import genmsg.template_tools
  File "/opt/ros/groovy/lib/python2.7/dist-packages/genmsg/template_tools.py", line 39, in <module>
    import em
ImportError: No module named em
make[2]: *** [/home/pablo/ros_ws/devel/include/baxter_maintenance_msgs/UpdateSource.h] Error 1
make[2]: *** Se espera a que terminen otras tareas....
Traceback (most recent call last):
  File "/opt/ros/groovy/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 41, in <module>
    import genmsg.template_tools
  File "/opt/ros/groovy/lib/python2.7/dist-packages/genmsg/template_tools.py", line 39, in <module>
    import em
ImportError: No module named em
Traceback (most recent call last):
  File "/opt/ros/groovy/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 41, in <module>
    import genmsg.template_tools
  File "/opt/ros/groovy/lib/python2.7/dist-packages/genmsg/template_tools.py", line 39, in <module>
    import em
ImportError: No module named em
[ 72%] make[2]: *** [/home/pablo/ros_ws/devel/include/baxter_maintenance_msgs/TareEnable.h] Error 1
make[2]: *** [/home/pablo/ros_ws/devel/include/baxter_core_msgs/EndEffectorProperties.h] Error 1
make[2]: *** Se espera a que terminen otras tareas....
Generating C++ code from baxter_core_msgs/AnalogOutputCommand.msg
Traceback (most recent call last):
  File "/opt/ros/groovy/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 41, in <module>
    import genmsg.template_tools
  File "/opt/ros/groovy/lib/python2.7/dist-packages/genmsg/template_tools ...