Running ./Tropicali.sh works for me, and does not give that error.
It looks like your archive is corrupted.
Try redownloading the game. Itch can corrupt downloads sometimes.
Is game/archive.rpa size 4139572282 in ls?
Viewing post in How do I get it to run on linux?
You should just be able to run the game.
If it can't run, try downloading it using another method that isn't itch.io, such as https://gofile.io/d/nWaoiL
That error likely means you need to redownload the game. Itch.io has an issue where it corrupts downloads a lot. So redownload it via itch or the link provided.