Ruby on Rails

Hey everybody,

I'm trying to test a little piece of code I wrote, and I get the
following error:

Exception: can't dup Symbol

It happens in the following line: try_to_login @valid_user, :remember_me
=> "1",
where the function try_to_login is:

def try_to_login(user, options = {})
user_hash = {:screen_name => user.screen_name, :password =>
user.password}
user_hash.merge!(options)
post :login, :user => :user_hash
assert logged_in?
end

I can't isolate the error, can anybody throw some light on it?

Thanks a lot in advance!
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