title: Maya 2013 error: Mayatomr.Geometry : unnamed object is not a mesh, ignored
body: <p>I want to render and merge groundplane with object
  I use Maya 2013
  when I try to execute it give me error:</p>
  
  <pre><code>convertLightmapSetup  -camera camera1 -showcpv;
  // Baking 1 maps
  // Cmd: convertLightmap  -camera camera1 initialShadingGroup 
             |ground_plane|ground_planeShape
  // Warning: (Mayatomr.Lightmap) : Some objects do not have a bakeset assigned, 
                  internal default settings are used for these objects. // 
  // Warning: (Mayatomr.Shader) : initialShadingGroup-ground_plane:lm: 
   referenced writable texture file 
  
  
  
  "C:/Users/.../Documents/maya/projects/default/renderData/mentalray/lightMap/
     baked-initialShadingGroup-ground_plane.tif" already exists, overwrite 
   **Error: (Mayatomr.Geometry) : unnamed object is not a mesh, ignored**
      // Baked 1 maps. 0 maps failed
      C:/Users/.../Documents/maya/projects/default/renderData/mentalray/lightMap/
       baked-initialShadingGroup-ground_plane.tif // 
  </code></pre>
  
  <p>Does anyone know the solution to this problem?
  Thanks in advance</p>