The model stops because of a new fatal warning that was added to
  detect erroneous situations with multiple real observations in a superperiod.
With the retroyr, there are zero real obs in the terminal
  super-years.  However the warning condition was set to <>1,
  rather than >1, so the model stops.
So, this should be a rather easy fix in the preliminary calcs section
  of the code. 
We are in the midst of testing the pre-release for 3.30.19.  We
  should be able to get this  fix into the full release in a couple of
  weeks and can make it available in the github action sooner.
Rick