tum_ardrone installation problem

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i'm trying to install the tum_ardrone. i follow the instruction in this page: link text

but when i reach the moment for build my package, it gives me this error:

jacopo@jacopo-HP-ProBook-4710s:~/rosbuild_ws/ardrone_autonomy$ rosmake
[ rosmake ] rosmake starting...                                                 
[ rosmake ] No package selected and the current directory is not the correct path for package 'ardrone_autonomy'.
[ rosmake ] Packages requested are: []                                          
[ rosmake ] Logging to directory /home/jacopo/.ros/rosmake/rosmake_output-20141119-162010
[ rosmake ] Expanded args [] to:
[]                                             
[ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.

did someone can help me?? i've ubuntu 12.04 and the hydro distro