Any idea why "knob.png" keeps showing up?

[Nonlinear]

I have cloned my plugins from the IPlugEffect example using the Youlean tool and for some reason when I go to compile them "knob.png" keeps showing up under Resources in Xcode.

There is no "knob.png" in my project - and so it throws a "cannot find file" compiler error if I forget to delete it from the file tree.

Any idea why this reference keeps getting copied into my projects? (please see attached screenshot)