KubeSpawner failed to start pod due to key error

Using kubespawner to spawn , but get below error

future: <Task finished coro=<KubeSpawner._start_reflector..catch_reflector_start() done, defined at /opt/middleware/anaconda_python/3.7.11/lib/python3.7/site-packages/kubespawner/spawner.py:2418> exception=SystemExit(1)>
Traceback (most recent call last):
File “/opt/middleware/anaconda_python/3.7.11/lib/python3.7/site-packages/kubespawner/spawner.py”, line 2420, in catch_reflector_start
await f
File “/opt/middleware/anaconda_python/3.7.11/lib/python3.7/site-packages/kubespawner/reflector.py”, line 383, in start
await self._list_and_update()
File “/opt/middleware/anaconda_python/3.7.11/lib/python3.7/site-packages/kubespawner/reflector.py”, line 233, in _list_and_update
for p in initial_resources[“items”]
KeyError: ‘items’