followed by this question, I got another question: I ignored the error above, and run the first demo:Hand Detection Demo, but I also got the error like: [rospack] couldn't find dependency [mapping_msgs] of [skeletal_tracker] [rospack] missing dependency however, the mapping_msgs package just can be installed on fuerte now(I'm not sure, but in this page http://www.ros.org/wiki/mapping_msgs, I can just choose the fuerte disco),I tried to use git clone https://github.com/ethz-asl/ros-mapping.git, but it shows that I have to input the username and password, so I'm puzzled now. anybody can help me? THX!