Symptoms
After upgrading to EdgeSight Server version 4.5 and launching the EdgeSight console, the following error message is displayed in the browser upon logon:
“Server Error in ‘/edgesight40’ Application
Parser Error Message: The 'pageBaseType' attribute must be set to a valid Type name (format: <typename>,<assemblyname>)
Source Error:
Line 150:
Line 151: <!-- Default page settings -->
Line 152: <pages pageBaseType="Reflectent.Core.Web.CorePage, Reflectent.Core.Web" autoEventWireup="true" enableViewState="false" enableSessionState="false"/>
Line 153:
Line 154: <!-- Session state setting -->
Source File: C:\Program Files\Citrix\System Monitoring\Server\EdgeSight 4.0\Pages\web.config Line: 152”

Cause
Microsoft .NET Framework 2.0 and 1.1 are installed on EdgeSight Server. The EdgeSight 4.5 Server requires .NET 2.0, but may still be configured to use .NET 1.1.
Resolution
Configure the EdgeSight Web site to use .NET 2.0:
1. Open Internet Information Services (IIS) Manager.
2. Open Default Web Site node in the left pane.
3. Right-click the edgesight40 Web site and select Properties.
4. Open the ASP .NET tab.
5. Change the ASP .NET version to 2.0.xxxxx.
6. Run the iisreset command.
7. Launch the console again.
More Information
CTX113673 – Citrix EdgeSight Administrator's Guide
CTX113676 – Citrix EdgeSight Installation Guide
CTX113870 – How to Migrate From EdgeSight 4.2 to Version 4.5