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

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: C:\Program Files (x86)\DocuWare\Setup Components

Version 7- 7.1:
DocuWare.Tools.DWWFUpgrader.exe
 
Version 7.2 - 7.9:
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 | Specified argument was out of the range of valid values. Parameter name: User GUID is not found