I'm trying to set up an auto incremental workflow so that when the number of items in a SharePoint list hits 5 an email is generated. I'm following this: https://www.habaneroconsulting.com/insights/Nintex-Workflows-makes-it-easy-to-create-an-auto-incrementing-column-in-SharePoint#.WSf26U32aUm
I've set up a separate list called Auto Incremental for the functionality. However when I get to stage 4 on the Set field value action. Nintex isn't seeing the Auto Incremental list or the Task # column. What am I doing wrong?