Cannot add material when inserting from a plugin via InsertModelSDF().

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Hi,

When I insert a model in the environment from a plugin with InsertModelSDF() and I try to give it a material, I get an error.

The code is something like this:

    std::stringstream xml;

    ...
    xml << "\t\t\t<visual name='sphere_visual_" << i << "'>\n";
    xml << "\t\t\t\t<geometry>\n";
    xml << "\t\t\t\t\t<sphere>\n";
    xml << "\t\t\t\t\t\t<radius>" << radius << "</radius>\n";
    xml << "\t\t\t\t\t</sphere>\n";
    xml << "\t\t\t\t</geometry>\n";
    //xml << "\t\t\t\t<material/>\n";
    //xml << "\t\t\t\t\t<script>\n";
    //xml << "\t\t\t\t\t\t<uri>file://media/materials/scripts/gazebo.material</uri>\n";
    //xml << "\t\t\t\t\t\t<name>Gazebo/Red</name>\n";
    //xml << "\t\t\t\t\t</script>\n";
    //xml << "\t\t\t\t</material>\n";
    xml << "\t\t\t</visual>\n";
    ...

    sdf::SDF sphereSDF;
    sphereSDF.SetFromString(xml.str());

    _parent->InsertModelSDF(sphereSDF);

If I uncomment the <material> tag I get an error and the whole model is not loaded.

Error [World.cc:1383] Unable to find a model, light, or actor in:
<sdf version='1.3'/>

Bug, or am I doing something wrong?

Thanks, Andrei