Why is this happening?Please help!
Unsolved
Qt 6
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Hi and welcome to devnet,
Without more details about what you are trying to do, it's impossible to answer.
Are you trying to build that file manually ?
Are you using a project management system ?
If so, is it qmake ? cmake ? Something else ?
If one of the two formers, read the QApplication class documentation. You have at the top the instructions on how to make it available with both these tools.
