asp.net mvc 5 - Html.Bootstrap() not resolving with FluentBootstrap -

i have installed fluentbootstrap v3.3.5 , bootstrap v3.3.5 in project, in view, html.bootstrap() gives me compilation error:

@using fluentbootstrap;  <h2>test</h2>  <div>     <hr />     @using (var form = html.bootstrap().form().begin())     {         using (var inputgroup = form.inputgroup().begin())         {             @inputgroup.inputgroupaddon("@")             @inputgroup.input().setplaceholder("username")         }         <br />         using (var inputgroup = form.inputgroup().begin())         {             @inputgroup.input()             @inputgroup.inputgroupaddon(".00")         }         <br />         using (var inputgroup = form.inputgroup().begin())         {             @inputgroup.inputgroupaddon("$")             @inputgroup.input()             @inputgroup.inputgroupaddon(".00")         }     } </div> 

i have included fluentbootrap in namespace section of ~/views/web.config.

what missing?

a bit of necro-post know have question:

you'll need install fluentbootstrap.mvc has html helpers asp.net mvc