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I committed a fix to the tutorial. Do a git pull and try again. I strongly recommend, though, that you follow the text in the tutorials on the ROS wiki page, e.g. here:

http://wiki.ros.org/roslisp/Tutorials/OverviewVersion#Calling_a_service_interactively

The text in those tutorials will help a lot to figure out what is going on in the tutorial code.

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