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As @l4ncelot said you have another map_server node with the same name launched in amcl_demo.launch so just get rid of your node in your launch file (since you only need one map_server ) and put the map_file argument in the amcl node :

<launch>
    <include file ="$(find turtlebot_bringup)/launch/minimal.launch" />
    <arg name="map_file" default="/home/gab/catkin_ws/src/gabS/Desktop.yaml" />

    <include file="$(find turtlebot_navigation)/launch/amcl_demo.launch">
         <arg name="map_file" value="$(arg map_file)"/>
    </include>
    <include file="$(find turtlebot_rviz_launchers)/launch/view_navigation.launch" />
</launch>