What does this mean?

MissingComponentException: There is no ‘CharacterController’ attached to the “FPSArms_Axe@Idle” game object, but a script is trying to access it.
You probably need to add a CharacterController to the game object “FPSArms_Axe@Idle”. Or your script needs to check if the component is attached before using it.
UnityEngine.CharacterController.get_velocity () (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/NewDynamics.cs:2806)
PlayerGUI.Update () (at Assets/Scriprts/GUI/PlayerGUI.js:147)

I dont know what this if anybody could help it would be awesome thx

This is exactly what it says. You’ve attached a script to a game object that requires a CharacterController component, but you did not attach one.

 Component > Physics > CharacterController