Hi everyone, please pardon any ambiguities or confusion since this is my first post and I am new to being a JIRA admin. I've created a custom workflow and attached it to a scheme that a project is referencing. When I go and create an Issue Type (in this example, a 'story' issue type) and try to start the workflow, I am getting an error with the following message:

The start of my workflow is here:

I get the exception when on the "Not Started" state trying to click "Start Development" to transition to the "Dev Started" state.
Any help would be greatly appreciated! Thanks!