I get red error messages for each of the "CreateAF2Building" lines saying that 4 arguments are required.
HI Ian, You may be using a different version of ScenProc. I'm using a ScenProc build dated 16/10/18. You can find this information right at the top of the screen after the version number. I had a look through the changelogs for Scenproc and can't see any changes to CreateAFSBuilding code since 16/10/18. Try updating and see if the problem goes away.