Hello, I am calling a method in another class, after the insertion of data. But this returning an error SQLite :

Qt Code: 
  1. QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
  2. QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
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Source:

insert_sales.cpp
Qt Code: 
  1. void DialogSales::insert_sale(){
  2.      //QSqlQuery 
  3.      if (qry.lastInsertId()>0){
  4.             QMessageBox::information(this,"Register", "Registered successfully.");
  5.             MainSystem *ms= new MainSystem(this);
  6.             ms->tableView_listSales();
  7.      }
  8. }
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MainSystem.cpp

Qt Code: 
  1. MainSystem::MainSystem(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainSystem){
  2.         ui->setupUi(this);
  3.         base = new connection(NAME_BASE);
  4.         if(!base->openBD()){
  5.            QMessageBox::critical(this, "Erro", ERRO_BASE);
  6.            return;
  7.          }
  8.      }
  9.  
  10.     void MainSystem::tableView_listSales(){
  11.         model = new QSqlQueryModel;
  12.         model->setQuery("SELEC * FROM inventory WHERE strftime('%Y-%m-%d', inventory_date)='"+dateTime.toString("yyyy-MM-dd")+"'");
  13.         model->setHeaderData(0, Qt::Horizontal, tr("Client"));
  14.         model->setHeaderData(1, Qt::Horizontal, tr("Address"));
  15.         model->setHeaderData(3, Qt::Horizontal, tr("Payment"));
  16.         model->setHeaderData(6, Qt::Horizontal, tr("Date"));
  17.         ui->tableView_sales->setModel(model);
  18.     }
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