The weird thing is that error should only pop up if the weapon deals damage and is not in your hand (as in being thrown), which is a bug. Have you turned on the visible capsule traces to see if it is at least doing that. I am going to fix the bug in 1.1 so thrown weapons do damage but I am not sure why it would give you that error if it is in your hand. Basically what is happening is that when I pass damage to the AI I pass the weapons Parent(aka the player) for future damage logs or kill logs. For whatever reason your sword isn’t getting its parent set when your grab it? Does this error happen with the my great sword and knife or just with your weapon?