Error for the New Workflow for Components


I would like to simplify the Express ECO workflow for "component" classification Parts. I created a new Express ECO workflow by saving as the original.

I am using an internal method to get different workflows for different classifications. So I defined the new workflow for the "Components" in the method.

I deleted "In Planning" activity in this new workflow. However, I get the below. I can not understand what the exact error is and how to fix it.