Session.evaluate() and @BusinessDays ERROR

I get an error with this simple code in a Java agent. I thought I can use @BusinessDays with evaluate.

Session session = getSession();

Vector vec = session.evaluate(“@BusinessDays([01/01/2001]; [12/31/2001]; 1:7)”);

ERROR is:

at lotus.domino.local.Session.NEvaluate(Native Method) at lotus.domino.local.Session.evaluate(Session.java:555) at lotus.domino.local.Session.evaluate(Session.java:546) at JavaAgent.NotesMain(JavaAgent.java:17)