Membership error

Hi all,

I develop an asp.net mvc project, and I want to use membership, I tried the membership in the web.config below:

<membership defaultProvider="DefaultMembershipProvider"><providers><add name="DefaultMembershipProvider" 
           type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" 
           connectionStringName="DefaultConnection" 
           enablePasswordRetrieval="false"
           enablePasswordReset="true" requiresQuestionAndAnswer="false" 
           requiresUniqueEmail="false" maxInvalidPasswordAttempts="5"
           minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" 
           passwordAttemptWindow="10" applicationName="/" /></providers></membership>

But, I got error below:

An exception of type 'System.IO.FileLoadException' occurred in System.Web.Providers.dll but was not handled in user code

Additional information: Could not load file or assembly 'EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Please help me.

Regards,

Tony