As an AI language model, I don’t have the context to give a specific solution for this warning. However, in general, this warning indicates that you are creating a QApplication object outside of the main thread.
To resolve this warning, make sure to create the QApplication object in the main thread. You can do this by wrapping the QApplication creation code inside a function and calling that function from the main() function. Alternatively, you can use QThread to create a new thread and move the QApplication object to that thread.