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solved, by adding the line <arg name="world_name" value="/home/mastlab/2.world"/> to the launch file so it will be :

<include file="$(find gazebo_ros)/launch/empty_world.launch">
  <arg name="paused" value="$(arg paused)"/>
  <arg name="use_sim_time" value="$(arg use_sim_time)"/>
  <arg name="gui" value="$(arg gui)"/>
  <arg name="headless" value="$(arg headless)"/>
  <arg name="debug" value="$(arg debug)"/>
<arg name="world_name" value="/home/mastlab/2.world"/>
</include>