Does anyone know how to fix this error when converting a prospect on a job requissition?

Summary: When attempting to convert a prospect to an applicant on a job requisition an error occurs. The requisition is Promotional only and the prospect is a current employee. Requisition status is 'Open - Posted'.

Content (please ensure you mask any confidential information): This is the error but since no dates are involved I'm confused as to what dates it's looking at.

Version (include the version you are using, if applicable): 26A

Code Snippet (add any code snippets that support your topic, if applicable):