Edit: Nevermind, I wasn't aware that I needed to put the data and audio folders from the part2 archive in the www folder. I only realized where they should go after checking the files of another RPG Maker game I have.
(You should probably put the instructions for that somewhere on the download page in case someone has the same problem I do.)
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I just found this game, and I just tried launching it for the first time and got this error.
I'm wondering if I extracted something wrong, or didn't download everything I needed...
