Server Error in '/' Application. Cannot find ContentPlaceHolder 'MainContent' in the master page '/Views/Shared/Site.Master', verify content control's ContentPlaceHolderID attribute in the content page. 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.Web.HttpException: Cannot find ContentPlaceHolder 'MainContent' in the master page '/Views/Shared/Site.Master', verify content control's ContentPlaceHolderID attribute in the content page. 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. Stack Trace: [HttpException (0x80004005): Cannot find ContentPlaceHolder 'MainContent' in the master page '/Views/Shared/Site.Master', verify content control's ContentPlaceHolderID attribute in the content page.] System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +1225 System.Web.UI.Page.get_Master() +66 System.Web.UI.Page.ApplyMasterPage() +19 System.Web.UI.Page.PerformPreInit() +65 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +335 Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4330.0