Getting this Engine Error means you might have missed some files while extracting detours_r5.
Make sure you get the .zip file from the release page: means the newest release available.
Afterwards, completely make sure you've selected all of the folders and files includes in that archive:
Extract everything into the main directory of the game, where r5apex.exe is. If you are completely sure you followed the steps correctly but the problem still persists, feel free to ask in our Discord in the #questions channel.
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