"all processes on machine have died, roslaunch will exit"

edit

Hi , i used source devel/setup.sh in my catkin_ws , and i have run roslaunch ros2opencv uvc_cam.launch device:=/dev/video1 . however, when i try to run roslaunch pi_face_tracker face_tracker_uvc_cam.launch , it gives me the following error :

'Summary

PARAMETERS

• /pi_face_tracker/abs_min_features

• /pi_face_tracker/add_feature_distance

• /pi_face_tracker/auto_face_tracking

• /pi_face_tracker/auto_min_features

• /pi_face_tracker/cascade_frontal_alt

• /pi_face_tracker/cascade_frontal_alt2

• /pi_face_tracker/cascade_profile

• /pi_face_tracker/expand_roi

• /pi_face_tracker/feature_type

• /pi_face_tracker/flip_image

• /pi_face_tracker/fov_height

• /pi_face_tracker/fov_width

  • /pi_face_tracker/good_feature_distance

  • /pi_face_tracker/max_face_size

  • /pi_face_tracker/max_mse

  • /pi_face_tracker/min_features

  • /pi_face_tracker/show_features

  • /pi_face_tracker/show_text

  • /pi_face_tracker/std_err_xy

  • /pi_face_tracker/surf_hessian_quality

  • /pi_face_tracker/use_depth_for_detection

  • /pi_face_tracker/use_depth_for_tracking

  • /pi_face_tracker/use_haar_only

  • /rosdistro

  • /rosversion

NODES / pi_face_tracker (pi_face_tracker/face_tracker.py)

ROS_MASTER_URI=localhost:11311

core service [/rosout] found

process[pi_face_tracker-1]: started with pid [6080]

Traceback (most recent call last):

File "/home/nyan/catkin_ws/src/pi_vision/pi_face_tracker/nodes/face_tracker.py", line 30, in <module> roslib.load_manifest('pi_face_tracker')

File "/opt/ros/hydro/lib/python2.7/dist-packages/roslib/launcher.py", line 62, in load_manifest sys.path = _generate_python_path(package_name, _rospack) + sys.path

File "/opt/ros/hydro/lib/python2.7/dist-packages/roslib/launcher.py", line 98, in _generate_python_path packages = get_depends(pkg, rospack)

File "/opt/ros/hydro/lib/python2.7/dist-packages/roslib/launcher.py", line 51, in get_depends vals = rospack.get_depends(package, implicit=True)

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 227, in get_depends s.update(self.get_depends(p, implicit))

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 227, in get_depends s.update(self.get_depends(p, implicit))

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 221, in get_depends names = [p.name for p in self.get_manifest(name).depends]

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 159, in get_manifest return self._load_manifest(name)

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 198, in _load_manifest retval = self._manifests[name] = parse_manifest_file(self.get_path(name), self._manifest_name)

File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 190, in get_path raise ResourceNotFound(name, ros_paths=self._ros_paths)

rospkg.common.ResourceNotFound: cv_bridge

ROS path [0]=/opt/ros/hydro/share/ros

ROS path [1]=/home/nyan/catkin_ws/src

ROS path [2]=/opt/ros/hydro/share

ROS path [3]=/opt/ros/hydro/stacks

[pi_face_tracker-1] process has died [pid 6080, exit code 1, cmd /home/nyan/catkin_ws/src/pi_vision/pi_face_tracker /nodes/face_tracker.py input_rgb_image:=/camera/image_raw output_image:=/pi_face_tracker/image __name:=pi_face_tracker __log:=/home/nyan/.ros/log/41da9096-d42b-11e3-a25e-b870f417ccf2/pi_face_tracker-1.log]. log file: /home/nyan/.ros/log/41da9096-d42b-11e3-a25e-b870f417ccf2/pi_face_tracker-1*.log

all processes on machine have died, roslaunch will exit

shutting down processing monitor...

... shutting down processing monitor complete done `

Can anyone help me out with this? Thanks in advance :)