trouble in finding POS -need for my project

[Anonymous]

Hi,
  Iam unable to resolve problem in getting POS.
  My code is as follows,
  
      POS.initialize();
      POS.getPOSForKey("welcome");

          while running , iam getting following errors

net.didion.jwnl.JWNLRuntimeException: DATA_EXCEPTION_004
  at net.didion.jwnl.data.POS.getPOSForKey(Unknown Source)
  at JwnlTest.main(JwnlTest.java:21)

          Kindly some one help me ? This is needed for my project.

     thanks,
     purna.