I tried downloading my own puzzle and for some reason it gave me this error.
The other puzzles being hosted don’t give this error to me...
Just tried it getting same error. Did you upload this with a PAL version instead of NTSC? (Not sure if that matters but it might since its a US Server). Also if you used a burned copy of Chu Chu Rocket, it may be a bad version and so that file could be structured incorrectly possibly. I'll message Shu to take a peak when he can