@CalmDog396 - This was answered (again) 4 days ago. Please use the search button before posting. See: PAYDAY 2 Cheats and Trainer for Steam - #1261 by Ravenfyre.
@Seth2820 - Make sure you are correctly following the instructions in the Info tab of the trainer, under the Play button. Also make sure your copy of the game is purchased from Steam, as opposed to from elsewhere or cracked. And that you are not attempting to use the trainer in multiplayer or co-op game modes. This may also help: "Wemod failed loading the cheats into your game" / "We’re having trouble downloading the cheats" - #2 by Ravenfyre.