Hello All,

My first post here in this forum.  I am running Exchange Server 2019 CU3 at home ab.  Upgraded the server to CU4 yesterday.  I did the following as it was a pre req for installing CU4.

1. .Net 4.8

2. C++ Redis VS 2012 and VS2013 x64

3. Restarted the server

4. Installed Exchange Server 2019 CU4

5. Install completed successfully

6. Able to send and receive email

The problem is with Exchange Server ECP - Exchange Control Panel which is operated through I E Browser.  When, I try to login, I am getting this error.  Not sure how to fix.  Please note ECP was working fine before when, I was running Exchange Server 2019 CU3.  This all started after the upgrade to CU4.  Appreciate your help.  RL

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0433: The type 'ASP.adminfeedback_ascx' exists in both 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ecp\67f1ad38\e5546d0a\App_Web_sru5d10r.dll' and 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ecp\67f1ad38\e5546d0a\App_Web_c0kfwzvq.dll'