[ros-users] roscore issue

Hi all,

I just tried to run roscore and these errors came up:

 File "/home/mars/ros/bin/roscore", line 34, in <module>
    from ros import roslaunch
  File "/home/mars/ros/core/roslib/src/ros/__init__.py", line 57, in
__getattr__
    return __import__(name)
  File "/home/mars/ros/tools/roslaunch/src/roslaunch/__init__.py", line 48,
in <module>
    from roslaunch.scriptapi import ROSLaunch
  File "/home/mars/ros/tools/roslaunch/src/roslaunch/scriptapi.py", line 42,
in <module>
    import roslaunch.parent
  File "/home/mars/ros/tools/roslaunch/src/roslaunch/parent.py", line 55, in
<module>
    import roslaunch.server
  File "/home/mars/ros/tools/roslaunch/src/roslaunch/server.py", line 70, in
<module>
    from roslib.msg import Log
ImportError: No module named msg

What could be the explanation for this?

-Ian
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