报错对话框Command interrupted是怎么回事？

ashio

比如下面的语句，好像加了判断语句就会弹出报错对话框，如果去掉if语句能实现点击按钮弹出消息对话框。请问这个警告对话框是什么意思？该如何解决？
void ObjectModelerBase::OnpMsgBoxOpenPushButtonPushBActivateNotification(CATCommand* cmd,
CATNotification* evt, CATCommandClientData data)
{
  // Add your code here
         if (NULL==_pMsgNotifiy)
         {
                _pMsgNotifiy = new CATDlgNotify(this,"MsgFromNLS",CATDlgNfyOK);
         }
                _pMsgNotifiy->SetText(this->GetTitle());
                _pMsgNotifiy->SetVisibility(CATDlgShow);
}

ashio