WebClient Settings does not open but displays a message box that reads:

Error in login with token: ClientProtocolManagers are not specified

Fix try by  

Going to DocuWare and Modules directory.
Right Click the DocuWare.Settings.msi file then click on "repair". 

This SHOULD fix it but in rare cases there may be something wrong with the settings files.

NOTE
The problem is NOT repairable by uninstalling and reinstalling the programs and settings because the actual settings are saved even when you uninstall. 

YOU MUST USE REPAIR to fix the issue, reinstall does not fix this issue.