[rules-users] DrlParser with "Unknown error while parsing..."

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