[Therion] Context point air-draught example from Therion Book fails

Seasons Greetings! In one of my scraps, the line; point 517.0 -483.0 label -text "15 Dec 2008" -scale xs -context point air-draught produces an error, D:\Program Files\Therion\therion.exe: error -- Late08RPElev_02.th2 [10] -- object context not allowed -- point air-draught This example is taken almost exactly from footnote 20, page 24 of the therion book. Is there something I'm doing wrong? (Still using 5.2.3) Bruce