Can't open app it's showing syntax error on old phone(android 8)

Same. Tried it with Joiplay and it had the same result.

Apparently this is an issue with old versions of android for rpgmaker games. I can verify this happens with 9 and 10 too. It just means the dev didn't even try to make the game compatible for those versions, despite it being an easy fix. Just manually update your android version until it works.