I made a VASL file for ASL 37 "Khamsin". This uses boards 27 and 28 (v6.4) and overlays H1, H3 and H4. When I load the VASL file, an error occurs:
VASL LOS disabled - unexpected error: java.lang.NullPointerException: Cannot read field "gridWidth" because "map" is null. VASSAL los active
VASL LOS disabled - unexpected error: java.lang.NullPointerException: Cannot read field "gridWidth" because "map" is null. VASSAL los active