roslang package cannot be found [closed]

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Hi.

i try to complile some source code, but i always get an error:

-- IRRLICHT_INCLUDE_DIR = /usr/include
  -- IRRLICHT_LIBRARY = /usr/lib/x86_64-linux-gnu/libIrrlicht.so
  -- Found IRRLICHT: /usr/lib/x86_64-linux-gnu/libIrrlicht.so  
  -- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so
  -- Looking for XOpenDisplay in /usr/lib/x86_64-linux-gnu/libX11.so;/usr/lib/x86_64-linux-gnu/libXext.so - found
  -- Looking for gethostbyname
  -- Looking for gethostbyname - found
  -- Looking for connect
  -- Looking for connect - found
  -- Looking for remove
  -- Looking for remove - found
  -- Looking for shmat
  -- Looking for shmat - found
  -- Looking for IceConnectionNumber in ICE
  -- Looking for IceConnectionNumber in ICE - found
  -- Found X11: /usr/lib/x86_64-linux-gnu/libX11.so
  -- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so  
  [rosbuild] WARNING: rosbuild_genmsg() was called, but the roslang package cannot be found.  Message generation will NOT occur
  CMake Error at /opt/ros/groovy/share/ros/core/rosbuild/public.cmake:790 (add_dependencies):
    add_dependencies Adding dependency to non-existent target:
    rosbuild_precompile
  Call Stack (most recent call first):
    CMakeLists.txt:30 (rosbuild_genmsg)

How can I fix that problem?

Thx!

NB.:

When i run "rosmake" a second time i get this error:

pr2rp@pr2rp-lx:~/code/rats_ros$ rosmake
[ rosmake ] rosmake starting...                                                                                                                                                                                                                                                      
[ rosmake ] No package or stack specified.  And current directory 'rats_ros' is not a package name or stack name.                                                                                                                                                                 
[ rosmake ] Packages requested are: []                                                                                                                                                                                                                                               
[ rosmake ] Logging to directory /home/pr2rp/.ros/rosmake/rosmake_output-20130716-232713                                                                                                                                                                                            
[ rosmake ] Expanded args [] to:
[]                                                                                                                                                                                                                                                  
[ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.                                                                                                                                                                                                   
pr2rp@robot-lx:~/code/rats_ros$ rosmake
[ rosmake ] rosmake starting...                                                                                                                                                                                                                                                      
[ rosmake ] No package or stack specified.  And current directory 'rats_ros' is not a package name or stack name.                                                                                                                                                                 
[ rosmake ] Packages requested are: []                                                                                                                                                                                                                                               
[ rosmake ] Logging to directory /home/pr2rp/.ros/rosmake/rosmake_output-20130716-232719                                                                                                                                                                                            
[ rosmake ] Expanded args [] to:
[]                                                                                                                                                                                                                                                  
[ rosmake ] ERROR: No arguments could be parsed into valid package or stack names.

When i do a "rospack find" i get the correct path /home/pr2rp/code/rats_ros