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It seems that the slam_gmapping node can not be located. check whether the slam_gmapping node exists:

(1) If you install gmapping package in deb, run this command and see whether "slam_gmapping" in the outputs:

cd /opt/ros/<your_distro>/lib/gmapping/ && ls

(2) If you install gmapping package in source (build in catkin workspace), run this command instead:

cd /<path_to_your_workspace>/devel/lib/gmapping/ && ls

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