[ros-users] error with opencv in image_transport tutorial

Hello.
i have an Ubuntu 10.04 and Ros diamondback.

I try to do image_transport tutorial (
http://www.ros.org/wiki/image_transport/Tutorials)

i run (as here
http://www.ros.org/wiki/image_transport/Tutorials/ExaminingImagePublisherSubscriber
)

-------------------------------------------------------------------------------------------
alexander@alexander-laptop:~/learning_image_transport$ rosrun
learning_image_transport my_publisher home/alexander/image.jpg
---------------------------------------------------------------------------------------------

And i got next error:
-----------------------------------------------------
OpenCV Error: Null pointer (NULL array pointer is passed) in cvGetMat, file
/tmp/buildd/ros-diamondback-vision-opencv-1.4.3/debian/ros-diamondback-vision-opencv/opt/ros/diamondback/stacks/vision_opencv/opencv2/build/opencv-svn/modules/core/src/array.cpp,
line 2380
terminate called after throwing an instance of 'cv::Exception'
what():
/tmp/buildd/ros-diamondback-vision-opencv-1.4.3/debian/ros-diamondback-vision-opencv/opt/ros/diamondback/stacks/vision_opencv/opencv2/build/opencv-svn/modules/core/src/array.cpp:2380:
error: (-27) NULL array pointer is passed in function cvGetMat

Aborted
--------------------------------------------------------------------------

How can i correct this situation?

Thank you