Geocortex Workflow must be licensed for use in production applications.

I got the warning message "Geocortex Workflow must be licensed for use in production applications." on my WF5 with ArcGIS Web App Builder. The workflow5 was deployed on premises. I have followed the instructions here. https://docs.geocortex.com/workflow/latest/help/Default.htm#wf5/help/widgets.htm#Deploy_the_Widgets_to_Web_AppBuilder_(Developer_Edition)%3FTocPath%3DOne-Time%2520Setup%7CRegister%2520the%2520Geocortex%2520Workflow%2520Custom%2520Widgets%7C_____2

But I still got the warning. Could you please help? Thanks very much.