'Could not load file or assembly' error after upgrading to Xtraction 2018

Document ID : KB000124087
Last Modified Date : 03/01/2019
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After upgrading to Xtraction 2018, following error is seen when loading the Xtraction URL:

Could not load file or assembly 'system.web.http, version= 5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencides. The located assembly's manifest definition does not match the assembly references. (exception from HRESULT: 0x80131040)

User-added image
Xtraction 2018.x
Windows OS
This error indicates that there is a key value missing in the WEB.CONFIG file.
1.  Download the attached WEB.CONFIG file
2.  Navigate to the 'Xtraction Software\Xtraction\Web\Server' directory on the Xtraction server
3.  Backup/rename the existing WEB.CONFIG file
4.  Place the downloaded WEB.CONFIG file into the directory
5.  Restart the IIS service
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