This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice This article is not considered official documentation for K2 software and is provided “as is” with no warranties.


When running the Registration Wizard, the below error is shown:

"Server Error
Exception of type 'System.Web.HttpUnhandledException' was thrown.
Argument 'userFqn' may not be null or empty
Parameter name: userFqn"


It was determined that the SharePoint farm and the account running the Registration Wizard was in a different domain and this domain had not yet been configured in K2.

These errors were also logged in the HostServer logs:


Troubleshooting Steps

Check and add the missing domain if applicable:

K2 Management Site > Users > K2 > Domains


K2 Workspace > Management Console > User Managers > K2 > Domains

* A restart of the K2 Blackpearl service/console is required.