My problem is when in an open javafx project and try to run it without editing it, an error appear like this, and everything install for java FX.
My problem is when in an open javafx project and try to run it without editing it, an error appear like this, and everything install for java FX.
You should check whether your getClass().getResource() call actually returns a non-null value. I assume your css-file is not in the right place.