I'm trying to do a simple authentication in my application using #{authenticator.authenticate} usage as demonstrated in booking example, however I'm running into the following exception:

java.lang.ClassCastException: org.jboss.seam.core.Expressions$1 cannot be cast to org.jboss.seam.core.Expressions$ValueBinding

This same exception also occur in the seam-booking example in the latest CVS build when you are trying to register a new user.