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To add to what jayess said, if you don't think another instance of that node should be running make sure you shut it down somehow (either closing your terminal windows and opening a new one, or use the task manager).
If for some reason you purposely want two versions of the same node running, you can start the second one with a unique name from the command line like this:
rosrun ratslam_ros ratslam_Youness src/ratslam_ros/config/config_irataus.txt.in __name:=my_unique_name