Can't read stuff from ptree.. please help

[lucky6969b]

Can't read the attribute from the ptree object. Any ideas how to do that?
Thanks
Jack

BOOST_FOREACH(ptree::value_type& v,	tree) {
		const std::string& nodeName = v.first;
		simData.FrameName = readString(v, "Name");
		simData.relative = readMatrix(v, "relative");				
		simData.obj = readMatrix(v, "object");
 		BOOST_FOREACH(ptree::value_type& v2,
			tree.get_child("FrameName.Mesh")) {
 			simData.MeshName = readString(v2, "<xmlattr>.name");	 << throws here
          	        simData.NumVertices = readInt(v2, "NumVertices");

std::string readString(const ptree::value_type& tree, std::string location)
{
	std::string str = tree.second.get<std::string>(location.c_str());
	return str;
}

<?xml version="1.0" encoding="utf-8"?>
<FrameName>
    <Name>Box001</Name>
    <relative>
        <matrix>
            <00>1</00>
            <01>0</01>
            <02>0</02>
            <03>0</03>
            <10>0</10>
            <11>1</11>
            <12>0</12>
            <13>0</13>
            <20>0</20>
            <21>0</21>
            <22>1</22>
            <23>0</23>
            <30>2.376553</30>
            <31>0</31>
            <32>20.12135</32>
            <33>1</33>
        </matrix>
    </relative>
    <object>
        <matrix>
            <00>1</00>
            <01>0</01>
            <02>0</02>
            <03>0</03>
            <10>0</10>
            <11>1</11>
            <12>0</12>
            <13>0</13>
            <20>0</20>
            <21>0</21>
            <22>1</22>
            <23>0</23>
            <30>0</30>
            <31>0</31>
            <32>0</32>
            <33>1</33>
        </matrix>
    </object>
    <Mesh name="Mesh_Box001">
        <NumVertices>24</NumVertices>
        <Vertices>
            <vector index="0">
                <x>-30.889</x>
                <y>0</y>
                <z>-36.3461</z>
            </vector>
        </Vertices>