QAxBase: Error calling IDispatch member Add: Exception thrown by server
             Code       : -2147467259

Could you ,please , help me to solve this problem?
here is my code

void MainWindow::on_saveReport_clicked()
{
    QString fileName = QFileDialog::getSaveFileName(this, tr("save report"),
                                                    "D:/Repoert.docx",
                                                    tr("Word Document (*.docx *.doc)"));

    if (true == fileName.isEmpty()){
        return;
    }
    QAxWidget *word = new QAxWidget("Word.Application", this, Qt::MSWindowsOwnDC);
    if(word->isNull()){
        QMessageBox::critical(this,tr("Critical"),tr("未安装office word"));
         return;
    }
    word->setProperty("DisplayAlerts", false);
    word->setProperty("Visible", false);
    QAxObject *documents = new QAxObject;
    documents = word->querySubObject("Documents");

    documents->dynamicCall("Add (QString)",  ":/template/reportTemplate.docx");
    QAxObject *readDocument = word->querySubObject("ActiveDocument");

    QAxObject *selection = readDocument->querySubObject("Content")->querySubObject("Find");
    bool bMatchCase      = false;
    bool bMatchWholeWord = false;
    bool bMatchWildCards = false;
    bool bReplaceAll     = true;
    QString flag1 = "txt1";
    QString target1 = "txt2";
    
    QVariantList vl = { flag1, bMatchCase, bMatchWholeWord, bMatchWildCards, false, false, true, 1, false, target1, bReplaceAll ? "2" : "1"};
    selection->dynamicCall("Execute(QString,bool,bool,bool,bool,bool,bool,int,bool,QString,int)",vl);

    //save
    readDocument->dynamicCall("SaveAs (const QString&)", fileName);
    readDocument->dynamicCall("Close (boolean)", false);
    word->dynamicCall("Quit(void)");
}

best regards,Quan