ROS Pluging in model.sdf (Not Working)

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<?xml version="1.0"?>
<sdf version='1.5' xmlns:xacro='http://ros.org/wiki/xacro'>
  <model name='plane'><!--The model element defines a complete robot or any other physical object-->
    <pose>0 0 0.246 0 0 0</pose> <!--A position (x,y,z) and oriantation(roll,pitch yaw) with respect to the specified frame -->
    <!-- -->
    <link name='base_link'> <!--A physical link with inertia,collision and visual properties.A link must be a child of model,and any number of links may exist in a model-->        
      <pose>0 0 0 0 0 0</pose><!--A position (x,y,z) and oriantation(roll,pitch yaw) with respect to the specified frame -->
      <inertial><!-- inertial properties of the links -->
        <pose>0 0 0 0 0 0</pose> <!--this is the pose of the inertial reference frame,relative to the specified reference frame.The origin of the inertial reference frame needs to be at the center of gravity.The axes of the inertial reference frame do not need to be aligned with the principal axes of the inertia -->
        <mass>1.5</mass> <!--the mass of the link -->
        <inertia> <!--3*3 rotational inertia matrix.Because the rotational inertia matrix is symmetric only 6 above diagonal elements of this matrix are specified here,using the attributes below -->
          <ixx>0.197563</ixx>
          <ixy>0</ixy>
          <ixz>0</ixz>
          <iyy>0.1458929</iyy>
          <iyz>0</iyz>
          <izz>0.1477</izz>
        </inertia>
      </inertial>
      <collision name='base_link_collision'> <!--The collision properties of a link .Note that this can be different from the visual properties of a likn,for example simpler collision models are often used to reduce computation time -->
        <pose>0 0 -0.07 0 0 0</pose> <!-- A position (x,y,z) and oriantation(roll,pitch,yaw) with respect to the specified frame -->
        <geometry><!-- the shape of the visual or collision object -->
          <box> <!--box shape -->
            <size>0.47 0.47 0.11</size> <!-- the three side lengths of the box.The origin of the box is in its geometric center(inside the center of the box) type vector3 -->
          </box>
        </geometry>
        <surface><!-- the surface parameters -->
          <contact>
            <ode> <!--ODE contact parameters -->
              <max_vel>10</max_vel> <!--maximum contact correction velocity truncation term -->
              <min_depth>0.01</min_depth> <!-- min allowable depth before contact correction impulse is applied -->
            </ode>
          </contact>
          <!--<friction>
            <ode/>
          </friction>-->
        </surface>
      </collision>
      <visual name='base_link_visual'><!-- The visual properties of the link.This element specifies the shape of the object for visualization purposes-->
        <pose>0.07 0 -0.08 0 0 0</pose><!-- a position and orientation with respect to the specified frame-->
        <geometry> <!-- The shape of the visual or collision object -->
          <mesh> <!--  mesh shape-->
            <scale>0.1 0.1 0.1</scale> <!--  scaling factor applied to the mesh -->
            <uri>model://plane/meshes/body.dae</uri> <!--mesh uri -->
          </mesh>
        </geometry>
        <material><!-- the materail of the visual element -->
          <script> <!--name of material from an installed script file This will override the color element if the script exists -->
            <name>Gazebo/Red</name> <!-- Name of the script within the script file -->
            <uri>__default__</uri><!-- uri of the material script ...