There is a bug in 7.1.6 that is causing your flow to fail. In the Qualify stage, the Determine Target Position is a multi-step process that has a decision shape as the first step. This decision shape is referening a decision table (CandidateQualification) that does not yet exist. It is this combination - flow starts with decision shape that references a decision-type record that does not yet exist - that causes the processing of the flow to fail.
I added a blank assignment prior to the decision shape, and now the case proceeds as expected. In a later exercise, you will create the CandidateQualification decision table and then you can delete that preceeding (empty) assignment.