Steps to reproduce :

- import the Sample Assets
- open the "CharacterThirdPersonAI" scene
- press play
- try to move the character and notice the error in the console

"SetDestination" can only be called on an active agent that has been placed on a NavMesh.
UnityEngine.NavMeshAgent:SetDestination(Vector3)
UnitySampleAssets.Characters.ThirdPerson.AICharacterControl:Update() (at Assets/SampleAssets/Characters/ThirdPersonCharacter/Scripts/AICharacterControl.cs:34)

*Note :
Regression from 5.0a16 Sample Assets.