I was able to download one of the game scenarios from the Joy of Code (episode 16). I tried to run the scenario and a notice appeared saying that the code was compiled using version 2.2 and would need to be updated to version 3.0. I said yes and the code was updated without errors, however no background or actors appeared. Instead I got message saying:
The world could not be constructed. The world subclass may not have a public constructor without parameters or may not be public.I tried to recompile the code but nothing happened. What should I do to fix this? Also, sometimes, I go into the World subclass and make changes. When I am done, the game area goes "fuzzy" and then I can't seem to get it to start without exiting and reloading the game. Is there a shortcut to this? Thanks for your help!