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This issue finally fixed by adding the JACKAL_LASER=1 parameter in the setup file in /etc/ros/setup.bash. (Thanks to ClearPath Robotic supports and engineers). By adding that parameter the laser read from topic /front/scan instead of /scan. before I added this parameter, gmapping looking for /front/scan and the laser topic published in /scan Thank you everyone who tried to help me.

Thank you Iman

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