I get this 'Corrupt game data. Please reboot...' What should i do?

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After i finished all the downloading and stuff, this happened
even after i deleted and tried to download again, this kept happening
i wonder why this happen, can someone help me?

You have modified files in your Grand Theft Auto V folder, do you have any mods installed?

@Villanueva it means you modded gta5 without mods folder, so well… you gotta either install a backup you have of your gta5 or reinstall completely