Spawn a blender file in Gazebo

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I had created a 3D model in Blender and had managed to spawn it in Gazebo, but an error occurred and I had to format my computer. After the format with the same source code I am not able to spawn the model in Gazebo. My urdf is:

<robot name="pool">

<link name="base_link">

 <inertial>
   <mass value="100.0" />
   <origin xyz="0 0 0" />
  <inertia  ixx="1.0" ixy="0.0"  ixz="0.0"  iyy="1.0"  iyz="0.0"  izz="1.0" />

 </inertial>

 <visual>
   <origin xyz="0 0 0" rpy="0 0 0" />
   <geometry>
     <mesh filename="package://gazebo_worlds/Media/models/pinky.3ds" />
   </geometry>
 </visual>

 <collision>
   <origin xyz="0 0 0" rpy="0 0 0" />
   <geometry>
     <mesh filename="package://gazebo_worlds/Media/models/pinky.3ds" />
   </geometry>
 </collision>

</link> </robot>

What is wrong? When I rosrun, no errors occurre but no model appears in Gazebo either.