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 beginnertutorials depends on non-existent package stdmsgs

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

plz help.thnx