Can't add Multimedia module in .pro

  • I'm trying to add multimediamodule in .pro like this: QT += core qml quick widgets multimedia svg xml, but it creates many errors:

    If I remove multimedia and add it again it will compile and run without errors. But as soon as I add something new to code, even just a variable like int a; it will ruin and show the same errors as above. I tried multimediawidgets too.

    I'm using Qt 5.5.

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