[Seaside] 3.0 session/request redirect

[radoslav hodnicak]

I have an outside form submitting login information to enter my seaside 
app, so as a first thing I want to do a redirect if the login info is 
correct, to keep browser from resubmitting the info. In my session #start 
I do

... process login info, save user
self requestContext redirect.

but when this code runs it gives me a 'You can only #call: and #answer: 
from within a callback or a Task.' error. Why? I'm running the latest 
seaside code from SS.

rado