rospack depends beginner_tutorials not working [closed]

edit

hi, i'm new at ros and was creating workspace and packages for fuerte. At tutorial 3 after creating package, to find the dependencies using command rospack depends beginner_tutorials following error is given:

[rospack] Error: package/stack beginner_tutorials depends on non-existent package std_msgs

previous commands $ rospack profile $ rospack find beginner_tutorials gave the output as mentioned in the tutorial. problem is occuring with this command: rospack depends beginner_tutorials

plz help.thnx