Class 'QWidge't has no member named 'setSize'

[Omicron]

I'm creating an application using Qt 4.7.1 and MinGW. I recently re-arranged my code into different functions, but when I try to compile my code with 'mingw32-make' this happens:

mainwindow.cpp:14: error: 'class QWidget' has no member named 'setSize'

In mainwindow.cpp on line 14 I have:

createSLabel();

createSLabel();

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This is the createSLabel function:

void MainWindow::createLLabel()
{
	localLabel = new QLabel(tr("Local view"), centralWidget);
	localLabel->setAlignment(Qt::AlignCenter);
}

void MainWindow::createLLabel()
{
	localLabel = new QLabel(tr("Local view"), centralWidget);
	localLabel->setAlignment(Qt::AlignCenter);
}

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I also have another function that's called that has exactly the same code as this but with a different QLabel, but no errors occur for that. I don't see what's wrong with my code. Why is this happening?