nhibernate - Deploying MVC Application to IIS 7 - Missing References -

i'm trying deploy mvc project on iis7, home page on uns on, when try access of views ot following error page

could not load file or assembly 'nhibernate.mapping.attributes, version=3.2.0.0, culture=neutral, publickeytoken=aa95f207798dfdb4' or 1 of dependencies. system cannot find file specified.

have missed step in deployment process? should avoid problem?

thanks