impedance_control_msgs not found (rosdep)

hi me again ;)... so fri-stanford works !!! (after we corrected the gravity vector to our needs...) so we tried ros next. where did you get the ros package impedance_control_msgs, is it a private one again :P?

kuka_lwr4plus_robot: Cannot locate rosdep definition for [impedance_control_msgs]
kuka_lwr4plus_tester: Cannot locate rosdep definition for [impedance_control_msgs]