Error on genmsg/template_tools.py (AttributeError: 'module' object has no attribute 'Interpreter')

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Hi all, I want to generate msg header files in a 64-bit Ubuntu 12.04 (ROS Hydro) by catkin_make agile_grasp_generate_messages. However, I got some error messages indicating that there's no Interpreter() in em module as the error occurs at the line interpreter = em.Interpreter(...) in genmsg/template_tools.py.

I think the error might relates to anaconda I installed before, because when I type python in my terminal, I got:

Python 2.7.9 |Anaconda 2.2.0 (64-bit)| (default, Mar  9 2015, 16:20:48) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Anaconda is brought to you by Continuum Analytics.
Please check out: http://continuum.io/thanks and https://binstar.org
>>>

and when I locate em.py, there are many candidates: (but those em.py under nltk dir do not contain class Interpreter)

/home/rosfuerte/anaconda/lib/python2.7/site-packages/nltk/cluster/em.py
/home/rosfuerte/anaconda/lib/python2.7/site-packages/nltk/cluster/em.pyc
/home/rosfuerte/anaconda/pkgs/nltk-3.0.2-np19py27_0/lib/python2.7/site-packages/nltk/cluster/em.py
/home/rosfuerte/anaconda/pkgs/nltk-3.0.2-np19py27_0/lib/python2.7/site-packages/nltk/cluster/em.pyc
/usr/lib/pymodules/python2.7/em.py
/usr/lib/pymodules/python2.7/em.pyc
/usr/local/lib/python2.7/dist-packages/nltk/cluster/em.py
/usr/local/lib/python2.7/dist-packages/nltk/cluster/em.pyc
/usr/share/pyshared/em.py
/usr/share/software-center/softwarecenter/ui/gtk3/em.py

So I remove the anoconda from my path by export PATH=... to remove anaconda/bin from PATH variable. After that, when I type python, I got:

Python 2.7.3 (default, Jun 22 2015, 19:33:41) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

But even I set the PATH to exlude anaconda/bin, I still got the same error when I catkin_make agile_grasp_generate_messages. Does anyone know how to solve this problem?

FYI, here's my error messages: (I think the key error is AttributeError: 'module' object has no attribute 'Interpreter')

Generating Lisp code from agile_grasp/Grasps.msg
Generating Lisp code from agile_grasp/CloudSized.msg
Generating Lisp code from agile_grasp/Grasp.msg
Generating EusLisp code from agile_grasp/Grasp.msg
Generating EusLisp code from agile_grasp/CloudSized.msg
Generating EusLisp code from agile_grasp/Grasps.msg
[ 57%] Generating C++ code from agile_grasp/Grasp.msg
Generating EusLisp manifest code for agile_grasp
[ 64%] Traceback (most recent call last):
  File "/opt/ros/hydro/share/gencpp/cmake/../../../lib/gencpp/gen_cpp.py", line 49, in <module>
    srv_template_map)
  File "/opt/ros/hydro/lib/python2.7/dist-packages/genmsg/template_tools.py", line 215, in generate_from_command_line_options
    generate_from_file(argv[1], options.package, options.outdir, options.emdir, options.includepath, msg_template_dict, srv_template_dict)
  File "/opt/ros/hydro/lib/python2.7/dist-packages/genmsg/template_tools.py", line 156, in generate_from_file
    _generate_msg_from_file(input_file, output_dir, template_dir, search_path, package_name, msg_template_dict)
  File "/opt/ros/hydro/lib/python2.7/dist-packages/genmsg/template_tools.py", line 101, in _generate_msg_from_file
    search_path)
  File "/opt/ros/hydro/lib/python2.7/dist-packages/genmsg/template_tools ...