Premature end of document error while reading a xml file in QT

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QT

While trying to traverse through an xml file, I get the error as " Premature End of Document".
My code is as follows.

void CxmlRd::parseXML()
{
    QString xmlFile= "D:/Neethu/xmlRd/sample.xml";
   QFile *xml= new QFile(xmlFile);
   QXmlStreamReader r(xml);
   if(!xml->open(QFile::ReadWrite|QIODevice::Text))
   {
       QMessageBox::critical(this,
                                       "QXSRExample::parseXML",
                                       "Cannot Open file",
                                         QMessageBox::Ok);

   }
   while(!r.atEnd())
   {
       if(r.readNextStartElement())
       {
           ui->textEdit->append("found element");
       }
       if(r.hasError())
       {
           QMessageBox::critical(this,
                                                         "QXSRExample::parseXML",
                                                         r.errorString(),
                                                         QMessageBox::Ok);
       }
   }
}

The xml I am trying to traverse is given below.
<pre lang="text"><?xml version="1.0" encoding="UTF-8" ?>
<persons>
<person id="1">
<firstname>John</firstname>
<surname>Doe</surname>
<email>john.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<person id="2">
<firstname>Jane</firstname>
<surname>Doe</surname>
<email>jane.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<person id="3">
<firstname>Matti</firstname>
<surname>Meikäläinen</surname>
<email>matti.meikalainen@example.com</email>
<website>http://fi.wikipedia.org/wiki/Matti_Meikäläinen</website>
</person>
</persons>



Please help me to fix this issue.