If after upgrading your Mi-Enterprise Middleware Server (to v11.3+), you receive an error similar to the one below:

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.searchablelistbox_ascx' exists in both 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\mfs\99cdb85d\196bce12\App_Web_searchablelistbox.ascx.cdcab7d2.85lp1gtb.dll' and 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\mfs\99cdb85d\196bce12\App_Web_2ooeo3ze.dll'

This may occur after attempting to access some of the administrative pages (Users, Groups, Templates, etc.).

To resolve this, please take the following steps:

  1. Edit the web.config file for the main server MFS installation (typically c:\inetpub\wwwroot\mfs\web.confg)
  2. Find the line that reads as follows: <compilation debug="false" targetFramework="4.5.2">
  3. Edit the line to read (please note the highlighted addition): <compilation debug="false" targetFramework="4.5.2" batch="false"
  4. Save the file