Cannot make a static reference to the non-static method

ok, so I feel like a douche but have been stuck on something that is usually simple.

I have tested these separate and they work fine but when I went to marry them together I had the dreaded Cannot make a static reference to the non-static method

addListenerClass :

if(confirmAdd == JOptionPane.YES_OPTION)
         {
            Course coreTemp = new CoreCourse(
                  ToolBar.getCourseCodeInput().getText(),
                  ToolBar.getCourseTitleInput().getText(), 
                  ToolBar.getCreditPoints());
                  System.out.println(coreTemp.toString());
                  ProgramMap.addCorePanel(coreTemp);
         }

and ProgramMap :

public class ProgramMap extends JPanel {
   
   public ProgramMap(AMSView Frame){
      all the bits
   
   public void addElectivePanel(Course coreTemp){
   all the bits...
}

ProgramMap.addCorePanel(coreTemp); - is the problem...

It is something stupid but I can not remember how to fix it.

Thanks
floppy