openni_launch problem

edit

I tried to use the openni_kinect. There is no errors or warnings when I installed openni_kinect as the instructions in http://www.ros.org/wiki/openni_kinect, but when I tried to use openni_launch by typing

roslaunch openni_launch openni.launch

in the terminal,

It has many errors as follows:

Found 23 error(s).

ERROR Communication with [/camera/depth/metric] raised an error: ERROR Communication with [/camera/driver] raised an error: ERROR Communication with [/camera/ir/rectify_ir] raised an error: ERROR Communication with [/camera_base_link] raised an error: ERROR Communication with [/camera/depth/metric_rect] raised an error: ERROR Communication with [/camera/register_depth_rgb] raised an error: ERROR Communication with [/camera/depth_registered/metric_rect] raised an error: ERROR Communication with [/camera/depth_registered/rectify_depth] raised an error: ERROR Communication with [/camera/depth/rectify_depth] raised an error: ERROR Communication with [/rosout] raised an error: ERROR Communication with [/camera/rgb/rectify_mono] raised an error: ERROR Communication with [/camera/depth_registered/metric] raised an error: ERROR Communication with [/camera_nodelet_manager] raised an error: ERROR Communication with [/camera/rgb/rectify_color] raised an error: ERROR Communication with [/camera_base_link3] raised an error: ERROR Communication with [/camera_base_link1] raised an error: ERROR Communication with [/camera/points_xyzrgb_depth_rgb] raised an error: ERROR Communication with [/camera_base_link2] raised an error: ERROR Communication with [/camera/disparity_depth] raised an error: ERROR Communication with [/camera/depth/points] raised an error: ERROR Communication with [/camera/disparity_depth_registered] raised an error: ERROR Communication with [/camera/rgb/debayer] raised an error: ERROR The following nodes should be connected but aren't: * /camera/depth/metric_rect->/rosout (/rosout) * /camera/depth/rectify_depth->/rosout (/rosout) * /camera_base_link->/rosout (/rosout) * /camera_base_link1->/camera_nodelet_manager (/tf) * /camera/register_depth_rgb->/rosout (/rosout) * /camera/points_xyzrgb_depth_rgb->/rosout (/rosout) * /camera_base_link2->/rosout (/rosout) * /camera/disparity_depth_registered->/rosout (/rosout) * /camera/driver->/rosout (/rosout) * /camera/depth_registered/metric->/rosout (/rosout) * /camera/ir/rectify_ir->/rosout (/rosout) * /camera/depth/metric->/rosout (/rosout) * /camera_nodelet_manager->/rosout (/rosout) * /camera/rgb/rectify_color->/rosout (/rosout) * /camera/depth_registered/rectify_depth->/rosout (/rosout) * /camera_base_link1->/rosout (/rosout) * /camera/disparity_depth->/rosout (/rosout) * /camera_base_link->/camera_nodelet_manager (/tf) * /camera_base_link3->/camera_nodelet_manager (/tf) * /camera/depth/points->/rosout (/rosout) * /camera/depth_registered/metric_rect->/rosout (/rosout) * /camera_base_link3->/rosout (/rosout) * /camera_base_link2->/camera_nodelet_manager (/tf) * /camera/rgb/rectify_mono->/rosout (/rosout) * /camera/rgb/debayer->/rosout (/rosout)

How to solve this problem?

I highly appreciate your time and great help!