why don't htmlhelper extensions work?

i'm building an asp.net mvc website. rather have all project, i've solid removed web, denote controller out opposite projects same solution, anxiety each-other.

the referencing goes this:

web ---[references]---> controller ---[references]---> model

now i wanted supplement 2 tradition methods htmlhelper category - they're called "includescript" "includestyle". any take unparalleled twine parameter, beget book couple add-on respectively.

i've combined an extender class, according support web, combined twin methods collected application.

now, i public.master page (which sure master-page, places where i intend methods), i enter formula such below:

<%= html.includescript("\js\jquery.js") %>

the intellisense picks adult includescript slight shows me syntax only fine. i'd design all should work.

but doesn't.

everything compiles, nonetheless shortly i run application, i following run-time blunder line 14 default.aspx.cs:

c:\\projects\\phonereel\\phonereel.web\\views\\shared\\public.master(11): blunder cs0117: 'system.web.mvc.htmlhelper' does enclose construction 'includescript'

here's line formula blunder happens on:

httphandler.processrequest(httpcontext.current);

any ideas going wrong here?