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I researched more and tried different suggestedsolutions and the problem turned out to be caused a bug in the recent gmapping release. thanks to @stevenwaslander answer, the fix for the problem that i explained in my question above, is as follows:

$ wget http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-gmapping/ros-indigo-gmapping_1.3.8.orig.tar.gz
$ cd ~/catkin_ws/src
$ tar xvf ../../ros-indigo-gmapping_1.3.8.orig.tar.gz   
$ mv ros-indigo-gmapping-1.3.8/ gmapping
$ catkin_make
$ sudo cp devel/lib/gmapping/slam_gmapping* /opt/ros/indigo/lib/gmapping/

I researched more and tried different suggestedsolutions suggested solutions and the problem turned out to be caused a bug in the recent gmapping release. thanks to @stevenwaslander answer, the fix for the problem that i explained in my question above, is as follows:

$ wget http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-gmapping/ros-indigo-gmapping_1.3.8.orig.tar.gz
$ cd ~/catkin_ws/src
$ tar xvf ../../ros-indigo-gmapping_1.3.8.orig.tar.gz   
$ mv ros-indigo-gmapping-1.3.8/ gmapping
$ catkin_make
$ sudo cp devel/lib/gmapping/slam_gmapping* /opt/ros/indigo/lib/gmapping/

I researched more and tried different suggested solutions and it turned out that the problem turned out to be was being caused by a bug in the recent 1.3.7 gmapping release. thanks to @stevenwaslander answer, the fix for the problem that i explained in my question above, is as follows:

$ wget http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-gmapping/ros-indigo-gmapping_1.3.8.orig.tar.gz
$ cd ~/catkin_ws/src
$ tar xvf ../../ros-indigo-gmapping_1.3.8.orig.tar.gz   
$ mv ros-indigo-gmapping-1.3.8/ gmapping
$ catkin_make
$ sudo cp devel/lib/gmapping/slam_gmapping* /opt/ros/indigo/lib/gmapping/