Failed to access IIS metabase System.Web.Hosting.HostingEnvironmentException: Failed to access IIS metabase I solved this by Reinstalling the .NET 2.0 Framework via aspnet_regiis -i Mutex could not be created System.InvalidOperationException: Mutex could not be created The Solution for this error is bit more complicate: Close all opened Visual Studios. Navigate to C:\Windows\Microsoft.NET\Framework\v2[....]\Temporary ASPNET pages. Delete the folder for your application (You can delete the temporary...