Here is the screen that appears when Bub tries to login. (Note: we are ignoring the password and all login involving that for right how. Hacking Exposed - J2EE and JSP has some great stuff on this.)
Welcome Bub Screen
If Bub tries to continue the last line becomes
NOTE: The HELP command does not have an immediate="true" flag set and so it generates the SAME error. The immediate flag causes commands to happen BEFORE the validations.