javaFX, throws NullPointerException, Location is required

Question

i have seen other answers but nothing have helped me

(sorry new to GUI only know basics of swing)

this is main class

package application;

imp         


        

Answer 1

try{    
scene.getStylesheets().add(new File(pathTocssFile).toURI().toURL().toExternalForm());
} catch (MalformedURLException e) {
e.printStackTrace();}