Why is this error: reference to ‘statusBar’ is ambiguous.. coming? Is this a bug?

[shadyabhi]

No, it dowsnt work...
But this works..

QMainWindow::statusBar()->showMessage(tr("File successfully loaded."), 3000);

QMainWindow::statusBar()->showMessage(tr("File successfully loaded."), 3000);

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BUT, MAIN AGENDA IS, IS IT A BUG??