Trying to parse an absolutely correct DRL (a regular build succeeds)...

    DrlParser parser = new DrlParser();
    FileReader fr = new FileReader( "some.drl" );
    // ... read file, create String
    String drl = ...
    PackageDescr pd = parser.parse( true, drl );
    if( pd == null ){
      System.out.println( "pd id null!" );
      System.out.println( parser.getErrors() );
    } else {
       ...
    }

...and the error is:

pd id null!
[[-1,0]: Unknown error while parsing. This is a bug. Please contact the Development team.]

?
-W