How to use third party themes in swing application?

Question

I want to use some third party themes (like [http://www.javasoft.de/synthetica/themes/|Synthetica] ) in my swing appliaction. i am using eclipse ide, got the jar file of theme and added the following code(according to the readme file i got with theme) with my application code
try
   UIManager.setLookAndFeel(new SyntheticaBlackMoonLookAndFeel());
  catch (Exception e)
   e.printStackTrace();
  }but after this modification its showing the following error
The type de.javasoft.plaf.synthetica.SyntheticaLookAndFeel cannot be resolved. It is indirectly referenced from required .class fileswhat does this mean? i tried searching on net but cant really find any useful answers
Contents of Readme file:
System Requirements
===================
Java SE 5 (JRE 1.5.0) or above
Synthetica V2.2.0 or above
Integration
===========
1. Ensure that your classpath contains all Synthetica libraries (including
   Synthetica's core library 'synthetica.jar').
2. Enable the Synthetica Look and Feel at startup time in your application:
    import de.javasoft.plaf.synthetica.SyntheticaBlackMoonLookAndFeel;
    try
      UIManager.setLookAndFeel(new SyntheticaBlackMoonLookAndFeel());
    catch (Exception e)
      e.printStackTrace();
    }   

Answer 1

It seems that you have the library that contains the SyntheticaBlackMoonLookAndFeel class, but you don't have the library which contains the SyntheticaLookAndFeel class which is needed by the LaF you're trying to load.
And their website even says in clear english: "The 'BlackMoon Look and Feel' can not be used standalone (without Synthetica)".