Qt这段代码会报_block_type_is_valid这个错误，请问是怎么回事

void MyClass::loadData()
{
QDomDocument DomDocu;

QDomNodeList DomList;
QFile file(filename);

QString errorStr;

QString desc;
QString id;
int errorLine;

int errorCol;

if(!DomDocu.setContent(&file,true,&errorStr,&errorLine,&errorCol))  
{  
    QMessageBox :: information(NULL,"错误信息","出错的行和列是",QString::number(errorLine, 10) 
        + QString(",") + QString::number(errorCol, 10));
    return;
} 
else
{
    DomList=DomDocu.childNodes();

    for (int i=0;i<DomList.count();i++)
    {
       if (DomList.at(i).nodeName()=="Table")
        {

        }
    }
}

}

http://blog.csdn.net/mfcing/article/details/43022877