Groovy Dataset Issue

Does anyone else have problem using the findAll method on a Groovy DataSet from within the groovyConsole?
 
Eg: (from GINA page: 342)
Everything works up to this point:
youngsters = athleteSet.findAll { it.dateOfBirth > '1970-1-1' }
youngsters.each { println it.firstname }

Gives:
Exception thrown: groovy.lang.GroovyRuntimeException: Could not find the ClassNode for MetaClass: org.codehaus.groovy.runtime.metaclass.ClosureMetaClass@1f9eba0[class Script13$_run_closure6]
 
I've traced the problem to a method on the DataSet class:
 
    private void visit(Closure closure, CodeVisitorSupport visitor) {
        if (closure != null) {
            ClassNode classNode = closure.getMetaClass().getClassNode();
            if (classNode == null) {
                throw new GroovyRuntimeException(
                        "Could not find the ClassNode for MetaClass: " + closure.getMetaClass());
            }
            List methods = classNode.getDeclaredMethods("doCall");
            if (!methods.isEmpty()) {
                MethodNode method = (MethodNode) methods.get(0);
                if (method != null) {
                    Statement statement = method.getCode();
                    if (statement != null) {
                        statement.visit(visitor);
                    }
                }
            }
        }
    }

That's where I get stuck.  Is it that it cannot find a class node for the closure that is my script running in the groovyConsole?
 
(BTW, it all works when I formally create a class, compile it, and call it from another class...like normal Java.)
 
 

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