Getting error when trying to modify rules.

I’m a new front user that is running the starter plan.  We were a Helpscout user and are moving to Front for the additional capabilities that it offers. 

We have a little over 150 domains and approximately 250 email address (Channels) that we’ve got setup in Front so far. We have setup 1 keyword tagging rule, 1 message recipients tagging rule, 1 archive email tagging rule and 1 route rule.  I’m now getting an error that says that my plan doesn’t include additional actions in workflows.

I’m not quite sure that means. Any idea why I cannot modify or add to my rules?