swing - Exception in thread "main" java.lang.IllegalArgumentException: illegal component position -

i working on gui code of java media player here. when try run main class, keep getting following error message :

exception in thread "main" java.lang.illegalargumentexception: illegalcomponent position        @ java.awt.container.addimpl(container.java:1085)        @ java.awt.container.add(container.java:465)        @ dj2.gui.artistspane.<init>(artistspane.java:19)        @ dj2.gui.mainframe.<init>(mainframe.java:36)        @ dj2.test.guitest.main(guitest.java:21) 

i think problem comes artistspane class, since 2 other errors reference it.

here code using artistspane :

public class artistspane extends jpanel{      public artistspane(){         this.setlayout(new flowlayout());        add(new tracksaddremovetoolbar(),flowlayout.trailing);}} 

the problem detected @ level of add method. what's wrong it? thanks!

you use flowlayout.trailing not when adding components when defining layout itself, , belongs flowlayout constructor parameter. rid of bit of code add method.

e.g., change

public class artistspane extends jpanel{      public artistspane(){         this.setlayout(new flowlayout());        add(new tracksaddremovetoolbar(),flowlayout.trailing);}} 

to

public class artistspane extends jpanel{      public artistspane(){            setlayout(new flowlayout(flowlayout.trailing));        add(new tracksaddremovetoolbar());     } // please place brakcets care  }