error C3861: 'tr': identifier not found, even with argument-dependent lookup

[Mars]

Use a static method QObject::tr() or QCoreApplication::translate() on line 33.

PS. Use code blocks around your code to make it more readable.

Thanks but it is not working, the compiler report the same message.

QPushButton *quit = new QPushButton(QObject::tr("Quit"), this);

QPushButton *quit = new QPushButton(QObject::tr("Quit"), this);

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