I got this following error while running the application. It was happened after updating nuget package using package manager console.
It was fixed by deleting all files from the bin folder of project. Right click on the project and click clean and build. It worked fine.
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
: Could not load type 'OpenAuth.MvcApplication'.
: Line 1: <%@ Application Codebehind="Global.asax.cs" Inherits="OpenAuth.MvcApplication" Language="C#" %> Source File: /global.asax Line: 1
If the above way is not working then I suggested you to restart the application OR remove the temporary files in the computer by Run command temp and %temp% OR include the obj folder in to the project and rebuild and run.