On the 30th April, GTA V was patched by Rockstar. The patch broke Script Hook V, which this mod (and most others) depend on.
As of yet, there has been no update to Script Hook V.

You can watch for updates on Script Hook V and download it here when it's ready:
http://gtaforums.com/topic/788343-vrel-script-hook-v/

When Script Hook V updates, please update your version of Script Hook V and download the latest version of this mod.

The mod download can be found here:
https://www.gta5-mods.com/scripts/ped-riot-chaos-mode

Thanks for your patience.