i got something called a failed zlib

[The Dark Knight]

how do i fix it?

[psykoteky]

This thread of yours says you used mods - messed something up - and 'deleted' the game. Does this mean you deleted 'all the files' or did you only uninstall and reinstall gta5? https://steamcommunity.com/app/271590/discussions/0/4407417073563276899/

If you deleted 'all the files/folders' in the gta5 folder --- verify the game files.

If you only uninstalled/reinstalled - you should clean your folder of mods - as uninstalling and reinstalling doesn't thoroughly clean all the non-vanilla files out of the game folder. Directions and pictures in link to compare with game folder to delete non-vanilla files -
https://steamcommunity.com/app/271590/discussions/0/1499000547495596089/#c1499000547495630914

There have been other 'zlib' errors in the past/various fixes --- but you'll need to give more details. Else you start getting into av/security, corrupt saves, folders, and other issues. All completely useless to test until you are 100% your game is 100% vanilla and no mods are involved. Once you install mods - all bets are off.

/goodluck

edit - R* 'info' on the error -
https://support.rockstargames.com/articles/204775458/Failed-zlib-call-error-in-Grand-Theft-Auto-V-for-PC (the above info prevents a 110+gb redownload they suggest -.-)