ApplicationController Plugin

I've created a plugin to generate error pages with a single function call. The basic idea is that in your action you could call error_forbidden and an error page would be rendered with the HTTP status code 402. This works great so far when called from within an action, but when I want to add the call to the "verfy" line, things break:

verify :method => :post, :only => [ :create, :update, :destroy ], :render => { :text => error_invalid }

Generates the error message: "undefined method `error_invalid' for EventsController:Class"

How can I make the methods visible to the controller outside the actions? For some reason I haven't been able to make it work for both. Here's a snippet from the plugin:

# ErrorPage module ErrorPagePlugin