UrlSeo Web Configiration error: Could not load file assembly

It has not any error Localhot during the working. but I am taking this error while Publish the web site. My Web project that have version NetFramework 4.0

I am getting the error putting the this seo setting on webconfig file ;

____________________________________________________________________________________________________________________________________________________________________________

        Server Error in '/' Application.

         Could not load file or assembly 'System.ServiceModel.DomainServices.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
    Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

    Exception Details: System.IO.FileNotFoundException: Could not load file or assembly 'System.ServiceModel.DomainServices.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

    Source Error:

    An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.`

____________________________________________________________________________________________________________________________________________________________________________

`**WEB CONFIG FILE Web.config**`

// I am getting the error putting the this seo setting on webconfig file ;

____________________________________________________________________________________________________________________________________________________________________________