ninject Inheritance security rules violatedby type: 'Ninject.Web.NinjectHttpModule' in mvc4

Question

I have a mvc4 web application. I decided to use ninject.mvc3. so I installed it from nuget. But it is throwing this exception:

Inheritance security rules violated by type: 'Ninject.Web.NinjectHttpModule'. Derived types must either match the security accessibility of the base type or be less accessible.

  private static IKernel CreateKernel()
        {
            var kernel = new StandardKernel(); //Throws exception this line
            kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
            kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
            return kernel;
        }

I tried to add '<trust level="Full"/>' in web.config. Also I tried to add

'[assembly: System.Security.SecurityRules(System.Security.SecurityRuleSet.Level1)]' in NinjectWebComman.cs. But again it didn't run.

What should I do?. Thanks.