cob_people_detecion on Hydro can't launch node kinect_image_flip

Hello, I downloaded and built successfully cob_people_detection for Hydro on ubuntu 12.04.5. However when I launch it, it says this error : > ERROR: cannot launch node of type [cob_image_flip/kinect_image_flip]: can't locate node [kinect_image_flip] in package [cob_image_flip] I checked and it looks like, kinect_image_flip is now called image_flip so I changed it in "image_flip.launch" and it removed the error but it still doesn't work. I can't even see myself in the window that is opened. I downloaded the sources from here : 1. https://github.com/ipa-rmb/cob_people_perception/tree/hydro_dev 2. https://github.com/ipa-rmb/cob_perception_common/tree/hydro_dev Thank you in advance