Ground Texture Doesn't work

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Hi all, I am trying to build a ground plan with a road texture. I would like also update this texture at runtime during the simulation (I don't know if it is possible and is actually an other problem). I followed 1 "tutorial": http://answers.gazebosim.org/question... and then a second to correct a possible error: http://answers.gazebosim.org/question...

But for me doesn't work anymore. I have no error but I see a yellow and gray plane that is not what i want. I organized the files as described in the tutorials. The files that I have are: model.sdf

<?xml version="1.0"?>
<sdf version="1.4">
<model name="my_ground_plane">
  <static>true</static>
    <link name="link">
      <collision name="collision">
        <geometry>
          <plane>
            <normal>0 0 1</normal>
            <size>100 100</size>
          </plane>
        </geometry>
        <surface>
          <friction>
            <ode>
              <mu>100</mu>
              <mu2>50</mu2>
            </ode>
          </friction>
        </surface>
      </collision>
      <visual name="visual">
        <cast_shadows>false</cast_shadows>
        <geometry>
          <plane>
            <normal>0 0 1</normal>
            <size>10 10</size>
          </plane>
        </geometry>
        <material>
          <script>
            <uri>model://my_ground_plane/materials/scripts</uri>
        <uri>model://my_ground_plane/materials/textures/MyImage.png</uri>
            <name>my_ground_plane/Image</name>
          </script>
        </material>
      </visual>
    </link>
  </model>
</sdf>

model.config:

<model> 
<name> My Ground Plane </name>
<version> 1.0 </version> 
<sdf version="1.5">model.sdf </sdf>
<description>
  My textured ground plane.
</description>
</model>

my_ground_plane.material

material my_ground_plane/Image
{
  technique
  {
    pass
    {
      ambient 1 1 1 1.000000
      diffuse 1 1 1 1.000000
      specular 0.03 0.03 0.03 1.000000 
      emissive 0.900000 0.900000 0.900000 1.000000

  texture_unit
  {
    texture floor.png
  }
    }
  }
}

Can someone help me. I am really new in Gazebo and I don't know how to approach the problem. Thanks in advance