when I use hector_vision like this.

roslaunch hector_motion_detection  motion_detection.launch 

some problem occurs.

roslaunch hectormotiondetection motion_detection.launch ... logging to /home/.ros/log/47b5fae2-fb98-11e4-9051-485ab6072ea3/roslaunch-ubuntu-3487.log Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://ubuntu:44327/

• SUMMARY

========

PARAMETERS * /motiondetection/imagetransport: compressed * /rosdistro: indigo * /rosversion: 1.11.10

NODES / motiondetection (hectormotiondetection/motiondetection)

auto-starting new master process[master]: started with pid [3499] ROSMASTERURI=http://localhost:11311

setting /runid to 47b5fae2-fb98-11e4-9051-485ab6072ea3 process[rosout-1]: started with pid [3512] started core service [/rosout] ***ERROR: cannot launch node of type [hectormotiondetection/motiondetection]: can't locate node [motiondetection] in package [hectormotion_detection]***