3827574 - Why there was Approver Error: "There are no approver defined in your workflow. Please contact your Expense Administrator." but user had a default approver added previously?

The user was added a default expense approver when their profile was created, but when they submitted an expense report, they received this error "There are no approver defined in your workflow. Please contact your Expense Administrator." Why is that?

User previously had default expense approver added but when he submitted the report, the error "There are no approver defined in your workflow. Please contact your Expense Administrator." popped up. , KBA , CON-CA-USP , User Profile , CON-EXP-ADM-WFL-WL , Workflow , Problem