Hi everyone, I seem to get an error when I enter the command when I follow this tutorial: link:text

I enter the command:

rosmake beginner_tutorials

and get the following error:

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[ rosmake ] rosmake starting...
[ rosmake ] Packages requested are: ['beginnertutorials']
[ rosmake ] Logging to directory /home/jay/.ros/rosmake/rosmakeoutput-20130806-231023 [ rosmake ] Expanded args ['beginnertutorials'] to: []
[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['beginner_tutorials'] [ rosmake ] ERROR: No arguments could be parsed into valid package or stack names. jay@J:~$ rosmake beginnertutorials [ rosmake ] rosmake starting...
[ rosmake ] Packages requested are: ['beginnertutorials']
[ rosmake ] Logging to directory /home/jay/.ros/rosmake/rosmakeoutput-20130806-231148 [ rosmake ] Expanded args ['beginner_tutorials'] to: []
[ rosmake ] WARNING: The following args could not be parsed as stacks or packages: ['beginner_tutorials'] [ rosmake ] ERROR: No arguments could be parsed into valid package or stack names

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Does anyone know what has gone wrong here? let me know if you need more information. Thanks