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roslaunch not working

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http://wiki.ros.org/rosbag/Tutorials/Exporting%20image%20and%20video%20data I am following this tutorial to export images from a bag file. in `src` in catkin workspace, I created a new package `myimage`. created a folder `launch`, and copy-pasted `export.launch` in that folder. I then, did `roslaunch export.launch` and I got the error message: Unable to contact my own server at [http://192.168.1.4:43535/]. This usually means that the network is not configured properly. A common cause is that the machine cannot ping itself. Please check for errors by running: ping 192.168.1.4 For more tips, please see http://www.ros.org/wiki/ROS/NetworkSetup I have tried this: http://answers.ros.org/question/10238/unable-to-contact-my-own-server/ but, it did not help in my case. It is still showing the same error

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