Instantiation of function 'x' required here, here but no definition is available

@hamoid wrote:

Hi!

Why are these warnings shown by qtcreator in the editor, but it still compiles fine?
How should the code be changed so the warnings are gone?

    gui.setup();
    gui.add(nPasses.setup("nPasses",1,0,10)); // instantiation of function 'ofxSlider<int>::setup' required here, but no definition is available
    gui.add(offset.setup("offset",1.0,0,20.0));  // instantiation of function 'ofxSlider<float>::setup' required here, but no definition is available
    gui.loadFromFile("settings.xml");

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