XML : QT XML reader reads the same tag everytime

I try to read an XML file and the reader reads it well, until it reads one specific tag (the close tag of Categories) and afterwards it read this tag infinite times.

This is the xml file:

       <?xml version="1.0" encoding="utf-8"?>          <MovieMain MovieName="movie1" Version="1.29746.011215">             <FrameGroups FirstFrame="START" LastFrame="END">                <GroupFramesDescription>ALL MOVIE</GroupFramesDescription>                   <frames Framenumber="1" >                      <ObjectsGroup Name="1">                         <LeftUpCorner X="30" Y="124" Z="0" />                         <RightDownCorner X="53" Y="160" Z="0" />                         <InfoAtt AttName="INDEX" AttInfo="1" />                         <Categories>                            <Category Name="computer" Probability="0.79"  />                            <Category Name="pen" Probability="0.7"  />                            <Category Name="desktop" Probability="0.1"  />                            <Category Name="mug" Probability="0.09"  />                         </categories>                      </ObjectsGroup>                           </frames>                </FrameGroups>                </MarkingChanges>                   <ChangesList UserName="ooo" Date="12/3/2015" StartTime="3:07:17 PM" FinishTime="3:08:06 PM" NetTime="00:00:43" GrossTime="00:00:48" FromClipStatus="Not Marked" ToClipStatus="Not Marked" ChangesetIndex="1" />                </MarkingChanges>            </MovieMain>    

And this is the function that I call to read the next element:

  orXmlReader->readNextStartElement();    

It gives me every time the next element till the close tag of Categories and than it read it again and again (I tried a loop of 100 times...).

I hope that you will help me as soon as you can, Thanks.