Hi, I have some problems to ask your help! I use kinect with openni.

after running  rosrun rviz rviz, the log shows,
[ INFO] [1297759443.332189019]: Loading general config from [/home/nutan/.rviz/config]
[ INFO] [1297759443.342981796]: Loading display config from [/home/nutan/.rviz/display_config]
[ERROR] [1297759444.477791717]: No techniques available for material [PointCloudMaterial0BillboardSphere]
[ERROR] [1297759444.479695234]: No techniques available for material [PointCloudMaterial0Billboard]
[ERROR] [1297759444.558933075]: No techniques available for material [PointCloudMaterial0Billboard]


Although RViz appears, flashing green light on the kinect sensor(may be because the sensor is connected but it can't be verified. Then, I set the Fixed Frame to openni_depth_optical_frame, and added a Point Cloud2 display, and set the topic to /camera/depth/points2. Turning the background to light gray. In another terminal, i used rosrun image_view image_view image_view image:=/camera/rgb/image_color, and the log is,

terminate called after throwing an instance of 'image_transport::TransportLoadException'
  what():  Unable to load plugin for transport 'image_view', error string:
According to the loaded plugin descriptions the class image_transport/image_view_sub with base class type image_transport::SubscriberPlugin does not exist. Declared types are  image_transport/raw_sub
Aborted


Please help me check the mistakes!