Looks like you forgot to update the Python version for Nuke in the latest version. (Or at least a past KB has that as the fault for blender)
The Deadline Plugin was not properly initialized. Application plugins must explicitly call
super().__init__()
in the Python constructor:def __init__()
.
EDIT: Nevermind, when I updated Deadline it automatically copied my Nuke folder into Custom since I had modified it.