I'm not sure why but all of a sudden I started getting an IllegalStateException getting thrown from SourceStringReader when I try to generate my Archimate diagram. It was previously working for me and I changed nothing. Now whenever I have !include https://raw.githubusercontent.com/ebbypeter/Archimate-PlantUML/master/Archimate.puml in my source it throws an IllegalState error. If I take it out everything behaves normal.