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The first thing that you should do would be to make sure that if you moved the laser_assembler files into your own folder you also changed the package names in the launch files. The next step would be to make sure that all nodes are running properly. For this, you can use:
rosnode list
Also, I noticed that you issued the command "rosbag play laser.bag", but you need to use the command "rosbag play --clock laser.bag" instead. This will replace the system time used by the laser assembler with the system time that was used during the recording of the rosbag. Otherwise, tf will be unable to re-create the correct transforms and no scans will be displayed.
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