Hi Alexander,

This may mean that you aren't passing the correct path to your image file.

Please ask "help me" and "how do I" type questions on http://answers.ros.org in the future. That makes it much easier for others to find answers to common questions.

Cheers,
Patrick

On Fri, Jun 10, 2011 at 4:28 AM, Alexander Shavykin <alex@shavykin.ru> wrote:
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

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