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It's not an answer but comment don't seem to work these days :s. Here are some leads to explore:

Can you see move base in the list when you run ls /opt/ros/indigo/lib/move_base/ ?
If not, this means that move base has not been properly installed. So try: sudo apt-get install ros-indigo-move-base
then you should see move base in /opt/ros/indigo/lib/move_base/ If yes, run rospack profile to update you package list and then you can try to run your node move_base again.

Hope this helps,