kittibag ERROR

Hi, when I try to run "roslaunch kittibag kittibag.launch", I got an error

"ERROR: cannot launch node of type [kittibag/kittibag]: Cannot locate node of type [kittibag] in package [kittibag]. Make sure file exists in package path and permission is set to executable (chmod +x)"

Can you help me to solve the error?
