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Scenario:
After upgrading DocuWare to version 7 or higher, the following error occurs after logging into DocuWare Web Client, and cannot do anything further.
 
"Specified argument was out of the range of valid values. Parameter name: User GUID is not found" 

Solution:
During the upgrade process, the Workflow Engine database was not upgraded. This could be for a variety of reasons. Attempt to run the Workflow upgrader again using the Upgrader Tools.

Default Path 7 - 7.10: C:\Program Files (x86)\DocuWare\Setup Components
Default Path 7.11 - 7.12: C:\Program Files (x86)\DocuWare\Setup Components\Upgrader

Version 7- 7.1:
DocuWare.Tools.DWWFUpgrader.exe

Version 7.2 - 7.10:
DocuWare.Upgrader.Tool.exe

Version 7.11 - 7.12: 
DocuWare.Upgrader.Tool.exe

If it is not successful, read the Setup Logs (default location C:\ProgramData\DocuWare\SetupLogs) to determine the exact cause. The error will no longer appear once all databases have been successfully upgraded (System, Data, Workflow Engine).

KBA is applicable for On-premise Organizations ONLY.
This article is valid for DocuWare versions: 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 7.10, 7.11, 7.12, Workflow Engine database, Specified argument was out of the range of valid values. Parameter name: User GUID is not found