No, this is not a real Sinatra error :).
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With session_lifetime you can set after how much time of inactivity your session should expire, you can execute an action when the session expires, and you can set where to redirect_to after session expiry.
class ApplicationController << ActionController::Base
expires_session :time => 2.hours, :redirect_to => ‘/login’
flash[:notice] = “Your session has been expired, and you have been logged out.”
<br />git://github.com/DefV/session_lifetime.git<br /></code
You're seeing this error because I think it is funny.