Qt Connect Error: No Matching Function for 'connect' Call

The error message 'no matching function for call to 'connect(...)' suggests that there is no matching function for the connect call. This issue might be related to the connection syntax, specifically when using lambda functions directly. Instead of directly using a lambda function, define a slot in your class and connect it to the currentIndexChanged signal of the QComboBox. Here's an example:

// Define a slot in your class
void UsersWidget::on_modeComboBox_currentIndexChanged(const QString& mode) {
    // Your slot implementation
}

// Connect the signal to the slot
connect(ui->mode, QOverload<const QString&>::of(&QComboBox::currentIndexChanged), this, &UsersWidget::on_modeComboBox_currentIndexChanged);

Make sure to replace UsersWidget with the appropriate class name if you are using a different class.