Server Error in '/' Application.

Exception of type 'Sitecore.Exceptions.UnknownTypeException' was thrown.

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: Sitecore.Exceptions.UnknownTypeException: Exception of type 'Sitecore.Exceptions.UnknownTypeException' was thrown.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:


[UnknownTypeException: Exception of type 'Sitecore.Exceptions.UnknownTypeException' was thrown.]
   APHA.SC.Configuration.ConfigManagerBase.Get(String fieldName) in C:\Project\APHA\sitecore_upgrade\APHA.Sitecore\Configuration\ConfigManagerBase.cs:131
   ASP.presentation_apha_sublayouts_header_ascx.__Render__control4(HtmlTextWriter __w, Control parameterContainer) +56
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   System.Web.UI.WebControls.LoginView.Render(HtmlTextWriter writer) +44
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   Sitecore.Web.UI.WebControls.Sublayout.DoRender(HtmlTextWriter output) +49
   Sitecore.Web.UI.WebControl.Render(HtmlTextWriter output) +315
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   Sitecore.Web.UI.WebControls.Placeholder.DoRender(HtmlTextWriter output) +121
   Sitecore.Web.UI.WebControl.Render(HtmlTextWriter output) +315
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +271
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +208
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   Sitecore.Web.FormAdapter.Render(HtmlTextWriter writer) +76
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +91
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +69
   ASP.presentation_apha_layouts_web_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) +153
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +9490


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0