ok, this is solution, from Slack, thank:
Are you receiving an error with the Oculus SDK? This is most likely because Oculus changed a previously public field to private. To fix this you will need to change the Oculus code in OvrAvatar.cs: 1)- Comment out the #if statements around the AssetsDoneLoading event. 2)- Add using UnityEngine.Events; to the top of the script. 3)- Comment out the last line with an error."