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extracting depth image from .bag file

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I want to extract depth image from .bag file just like [the tutorial](http://answers.ros.org/question/9652/extracting-images-from-rosbag/). But when I run `$ roslaunch export.launch` , the error occurred as below: SUMMARY ======== PARAMETERS * /rosdistro * /rosversion NODES / extract (image_view/extract_images) rosbag (rosbag/play) ROS_MASTER_URI=http://localhost:11311 core service [/rosout] found process[rosbag-1]: started with pid [9394] process[extract-2]: started with pid [9405] [ INFO] [1413444044.771603283]: Initialized sec per frame to 0.100000 [ERROR] [1413444046.270973202]: Client [/extract] wants topic /camera/depth/disparity to have datatype/md5sum [sensor_msgs/Image/060021388200f6f0f447d0fcd9c64743], but our version has [stereo_msgs/DisparityImage/04a177815f75271039fa21f16acad8c9]. Dropping connection. pls help me to resolve it.Thanks.

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