File does not exist when redeeming.

Good morning, so this plugin has been working perfectly ever since setting it up, allowing me to redeem kits, wipe the player data and redeem again but today for some odd reason I'm getting "File does not exist" when trying to click the "Redeem" button, I honestly have no idea what's causing this since no errors are being thrown up in the console. Any help is much appreciated

 

UPDATE: After restarting the server it's now saying "Couldn't ray something valid in front of you" when clicking on the "Redeem" button.

UPDATE #2: So it turns out Rust Kits and Copy Paste are conflicting, upon unloading CP and reloading RK all works perfectly fine..