[rules-users] Problem with DSL in Drools 4.0.3

[tansey]

I'm new to Drools, and I've setup the latest version of it in Eclipse 3.2.
I'm having trouble whenever I try to use a DSL though.  I took the standard
Hello World example and added the 'mylang.dsl' file, and changed the lines
in DroolsTest.readRule() as follows:

private static RuleBase readRule() throws Exception {
		//read in the source
		Reader source = new InputStreamReader(
DroolsTest.class.getResourceAsStream( "/Sample.drl" ) );
		
		//optionally read in the DSL (if you are using it).
		Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream(
"/mylang.dsl" ) );

		//Use package builder to build up a rule package.
		//An alternative lower level class called "DrlParser" can also be used...
		
		PackageBuilder builder = new PackageBuilder();

		//this wil parse and compile in one step
		//NOTE: There are 2 methods here, the one argument one is for normal DRL.
		//builder.addPackageFromDrl( source );

		//Use the following instead of above if you are using a DSL:
		builder.addPackageFromDrl( source, dsl );
		
		//get the compiled package (which is serializable)
		Package pkg = builder.getPackage();
		
		//add the package to a rulebase (deploy the rule package).
		RuleBase ruleBase = RuleBaseFactory.newRuleBase();
		ruleBase.addPackage( pkg );
		return ruleBase;
	}


Even if I remove all rules from the dsl file, it still gives me the same
error:
org.drools.rule.InvalidRulePackage: 
[4] Unable to expand: m : Message( status == Message.HELLO, message :
message )
[6] Unable to expand: 		System.out.println( message ); 
[7] Unable to expand: 		m.setMessage( "Goodbye cruel world" );
[8] Unable to expand: 		m.setStatus( Message.GOODBYE );
[9] Unable to expand: 		update( m );
[5] Unable to expand: m : Message( status == Message.GOODBYE, message :
message )
[7] Unable to expand: 		System.out.println( message );
[8] Unable to expand: 		m.setMessage( message );
	at org.drools.rule.Package.checkValidity(Package.java:424)
	at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:361)
	at com.sample.DroolsTest.readRule(DroolsTest.java:64)
	at com.sample.DroolsTest.main(DroolsTest.java:21)



Anyone have an idea of what's wrong?
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