How do I compile this jar file

[peahead]

Thanks for your help keang.

Your code has removed the errors on the java file 'DragArea' (thanks!) but I am still unable to compile the project as 2 other java files 1) Jabble and 2) Toolbarframe contains errors

1) Jabble.java

NetBean 6.8 stops compiling at line 649 on Jabble.java; this is the relevant error:

Listening on javadebug
User program running
Debugger stopped on uncompilable source code.
Thread main stopped at Jabble.java:649.


The code at line 649 reads as follows:

 f2 = new DragArea();

When I hover over the line with the mouse it says cannot find symbol
symbol: constructor DragArea
location: class DragArea

Also, in the Jabble file NetBeans finds errors in the following code (line 2 and 5 respectively) saying variable tmp31_30 might not have been intialized

        {
            problemField.setText(s);
                Jabble tmp31_30 = tmp31_30; 
    if (tmp31_30 == null)
      throw null;
    new Jabble.Reminder(tmp31_30, 3);
            return;
        }

2) Toolbarframe.java

This file contains 42 errors mainly surrounding 'package super does not exist'

Any suggestions?

I attach another screenshot for reference.

Again, thanks for your time and help