Hi Dear All,

I changed one of the world file to put some cubes in world but it doesn't work, when i run this world just one cube comes to world,

<?xml version="1.0" ?>
<sdf version="1.4">
  <world name="default">
    <!-- A global light source -->
    <include>
      <uri>model://sun</uri>
    </include>
    <!-- A ground plane -->
    <include>
      <uri>model://ground_plane</uri>
    </include>
    <!-- First Cube -->
    <include>
      <uri>model://cube_small</uri>
      <pose>-3 -3 0 0.0 0.0 0.0</pose>
    </include>
<!-- Second Cube -->
    <include>
      <uri>model://cube_small</uri>
      <pose>3 3 0 0.0 0.0 0.0</pose>
    </include>
  </world>
</sdf> 

any one knows what is problem?