Generic Method Problem in Unity Dependency Injection Container

This problem is related to Unity Application block (Dependency Injection container).
In some of my class files, I wanted to resolve my class by giving type name as usual

Container.Resolve<idictionary><string,>>("somename");</idictionary>

But it was giving the following error.

The non-generic method 'Microsoft.Practices.Unity.IUnityContainer.Resolve(System.Type, string, params Microsoft.Practices.Unity.ResolverOverride[])' cannot be used with type arguments

I was banging my head on the wall as the same code is working which is written in some other class file.

After much investigation, I found that by adding a reference to unity like below solved the problem!

using Microsoft.Practices.Unity; 

I got stuck in the mirage of extension methods! :((