Wrong XML produced by MappedXMLStreamReader

{"folders":{
            "folder":[
                {
                    "name":"images",
                },
                {
                    "name":"misc",
                }
            ]
            }
}

<folders>
  <folder>
    <name>images</name>
 </folder>
  <folder>
    <name>misc</name>
 </folder>
</folders>

        JSONObject obj = new JSONObject(new JSONTokener(getClasspathFileContent("json/valid/test.txt")));
        XMLStreamReader r = new MappedXMLStreamReader(obj, new MappedNamespaceConvention(config));


        StringBuilder indent = new StringBuilder();
        int c;
        while(r.hasNext()) {
            if (XMLStreamReader.START_ELEMENT == r.next())
            {
                System.out.print(indent);
                System.out.println("<"+r.getName()+">");
                indent.append("  ");
            } else if (XMLStreamReader.END_ELEMENT == r.next()) {
                indent.replace(0, 2, "");
                System.out.print(indent);
                System.out.println("</"+r.getName()+">");
            }
        }