I tried to update to version 7 and my system is no longer running.  I contacted my host and retrieved a backup but still cant get it to run.  Any help is appreciated.

This is the error when trying to connect to the site (after the restore): 

Server Error in '/' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0234: The type or namespace name 'Caching' does not exist in the namespace 'System.Runtime' (are you missing an assembly reference?)

Source Error:


Line 19: using System.Linq;
Line 20: using System.Net;
Line 21: using System.Runtime.Caching;
Line 22: using System.ServiceModel.Syndication;
Line 23: using System.Web;

Source File: e:\web\faithgro\App_Code\SyndicationFileHelper.cs Line: 21


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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2558.0