Unsolved Parameter count mismatch

[Designer23]

I wrote this code and i got an error "Parameter count mismatch", btw, I connect successfully to the database. how to solve it?
this is the code :

db = QSqlDatabase::addDatabase("QSQLITE");  //this is the driver for SQL Lite
    db.setPort(3306);
    db.setHostName("sql2.freemysqlhosting.net");
    db.setPassword("*****");
    db.setUserName("sql2****");
    if(!db.open())
        ui->label->setText("<font color='red'>Failed to connect to database.</font>");
    else
        ui->label->setText("<font color='green'>Connected to database and Opened.</font>");


qsr.prepare("INSERT INTO  mytab(machine_id, operator_id) VALUES(?,?);");
    qsr.addBindValue(ui->lineEdit->text());
    qsr.addBindValue(ui->lineEdit_Operator_ID->text());
    if(qsr.exec())
        QMessageBox::information(this, "State","Saved",QMessageBox::Ok);
    else
        QMessageBox::information(this, "State", qsr.lastError().text(),QMessageBox::Ok);

[sierdzio]

@Designer23 said in Parameter count mismatch:

"Parameter count mismatch"

SQLite shows this error for basically any error that occurs :-( Syntax, parameter count, parameter types - all kinds of things can trigger it.

Are machine_id and operator_id really strings, not integers?

[Designer23]

@sierdzio yes a mixage of letters and integers

[JonB]

@Designer23
Show the definition (including columns) of table mytab.

[mchinand]

Are you missing a call to QSqlDatabase::setDatabaseName? Are you actually trying to connect to a Mysql database (guessing based on the port number) instead of a SqlLite database?