setText using a string read from file

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Hi all, I hope this is an easy question. How do I go about solving this problem I have with setText

This is my code:

string line;
 
    ifstream myfile("example.txt");
    if (myfile.is_open()) // Checks to see whether myfile opens
        {
           getline(myfile, line);
           ui->QuestionBox->setText(line);
 
        } else ui->QuestionBox->setText("An error has occured!");

string line;

    ifstream myfile("example.txt");
    if (myfile.is_open()) // Checks to see whether myfile opens
        {
           getline(myfile, line);
           ui->QuestionBox->setText(line);

        } else ui->QuestionBox->setText("An error has occured!");

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It keeps throwing up an error. Is this because setText is supposed to have a QString associated with it... if so how do i overcome this problem. C++ didn't confuse me until I started learning QT, now nothing seems to work

Thanks for your help