move_base_stage Tutorial

Following the tutorial of amazing ROS in: http://www.ros.org/wiki/move_base_stage/Tutorials/stage%20and%20navigation%20stack

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Well trying the tutorial everything went fine until I followed the step #5. At the last command I recieved an error message like this:



So I went to the .cc code and found the part of the code where that error message was generated:



I coulnd't find where actually the error was, so I decided to change the !=4 to !=3 and see what happens...

After making stage I ran the willow.world once again...

It didn't work, I changed the values first and then the message and it didn't change, I also rosmake stage and nothing... It seems to bee usign another code, because in all the extension of the model.cc there is no other message like that, I also might be reading a copy of that code in another part... so I will follow all the instructions again and see if it works well...
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roscp is a useful commandline tool for copying files from one package to another.
pr2 throws a robot on map =D

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map_server
Provides the map_server ROS Node, which offers map data as a ROS Service. It also provides the map_saver command-line utility, which allows dynamically generated maps to be saved to file.
Maps manipulated by the the tools in this package are stored in a pair of files. The YAML file describes the map meta-data, and names the image file. The image file encodes the occupancy data.

http://www.ros.org/wiki/map_server
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Other resources:

Navigator Stack and Stage:
Simple tutorial that sets up navigation stack and rosstage. Can be used by any new beginner just to see how awesome and simple ROS is