Hello!
Antiviruses will react this way to trainers sometimes. Usually purely because of the way they work, which is by injecting values into the RAM of your PC.
This thread explains how to effectively resolve it: "Wemod failed loading the cheats into your game" / "We’re having trouble downloading the cheats" - #2 by Ravenfyre.
And this thread explains in detail why it happens: My antivirus marked WeMod as a Trojan - #2 by Ravenfyre.