Questions about mv_Bluefox_drivers ??? [closed]

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Hi, I tried running the mv_Bluefox_driver from the CCNY stack with the camera mvBluefox 105C, but ran into two problems:

1) when i ran roslaunch mv_bluefox_driver camera_node.launch, everything seems okey, but anyway i can't get the image form rosrun rviz rviz. i don't know why ???

2) how could i write a Subscriber correctly to receive the image from the Camera ? i do wrote a subscriber but it can't receive the image from Topic /mv_bluefox_camera_node/image_raw. But why ??? OpenCV Error: Image step is wrong () in cvInitMatHeader, file /tmp/buildd/libopencv-2.3.1+svn6514+branch23/modules/core/src/array.cpp, line 162 terminate called after throwing an instance of 'cv::Exception' what(): /tmp/buildd/libopencv-2.3.1+svn6514+branch23/modules/core/src/array.cpp:162: error: (-13) in function cvInitMatHeader

OpenCV Error: Image step is wrong () in cvInitMatHeader, file /tmp/buildd/libopencv-2.3.1+svn6514+branch23/modules/core/src/array.cpp, line 162 terminate called after throwing an instance of 'cv::Exception' what(): /tmp/buildd/libopencv-2.3.1+svn6514+branch23/modules/core/src/array.cpp:162: error: (-13) in function cvInitMatHeader

thanks for the help. Qiuyue.