Enter the puzzle data into the text field, then click on the first button ‘Start’. The applet will try to read in the puzzle data, and start solving it in a separate window. Any errors or warnings it encounters are displayed in the lower text area. The second button, ‘Clear’, clears both text fields. The third button, ‘Stop’, button stops all puzzles being solved in windows.
A puzzle is specified as a text file in a particular format. If you try to supply a puzzle in a different format, or something other than a Nonogram puzzle, you're unlikely to get a solution.
Some less important parts of the puzzle format are not supported. Simply delete the troublesome lines. The (admittedly cryptic) error messages indicate which line is causing trouble.