Just created a main scene, added a Character and this error comes out.
Error: There is no look source attached to the character. Ensure the character has a look source attached. For player characters the look source is the Camera Controller, and AI agents use the Local Look Source.
UnityEngine.Debug:LogError(Object)
Opsive.UltimateCharacterController.FirstPersonController.Character.MovementTypes.Combat:GetDeltaYawRotation(Single, Single, Single, Single) (at Assets/Opsive/UltimateCharacterController/Scripts/FirstPersonController/Character/MovementTypes/Combat.cs:32)
Opsive.UltimateCharacterController.Character.UltimateCharacterLocomotionHandler:GetDeltaYawRotation() (at Assets/Opsive/UltimateCharacterController/Scripts/Character/UltimateCharacterLocomotionHandler.cs:200)
Opsive.UltimateCharacterController.Game.KinematicCharacter:Move(Boolean) (at Assets/Opsive/UltimateCharacterController/Scripts/Game/KinematicObjectManager.cs:235)
Opsive.UltimateCharacterController.Game.KinematicObjectManager:FixedUpdate() (at Assets/Opsive/UltimateCharacterController/Scripts/Game/KinematicObjectManager.cs:856)