ASP.NET Could not load type 'System.String'

Question

System.Configuration.ConfigurationErrorsException: Attempting to load this property's type resulted in the following error: Could not load type 'System.String'. (D:\Inetpub\wwwroot\driverseat\web.config line 223)
---> System.Web.HttpException: Could not load type 'System.String'. 
at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) 
at System.Web.Profile.ProfileBase.ResolvePropertyType(String typeName) 
at System.Web.Profile.ProfileBase.AddPropertySettingsFromConfig(Type baseType, Boolean fAnonEnabled, Boolean hasLowTrust, ProfilePropertySettingsCollection settingsCollection, String groupName) 
--- End of inner exception stack trace --- 
at System.Web.Profile.ProfileBase.InitializeStatic() 
at System.Web.Profile.ProfileBase.Create(String username, Boolean isAuthenticated) 
at System.Web.HttpContext.get_Profile() at MasterPage.get_Profile() 
at MasterPage.Page_Load(Object sender, EventArgs e)

Answer 1

Is this a duplicate of

ASP.NET Could not load type ‘System.String’