ERROR:asyncio:Task exception was never retrieved while running Jupyterhub

Hi,

When i run
[root@cmaster jhub]# jupyterhub --ip 192.168.1.211 --port 9090

tornado.web.HTTPError: HTTP 500: Internal Server Error (Spawner failed to start [status=127]. The logs for test may contain details.)
[W 2020-03-16 18:51:22.519 JupyterHub user:692] test’s server never showed up at 127.0.0.1:60752/user/test/ after 30 seconds. Giving up
[E 2020-03-16 18:51:23.101 JupyterHub gen:599] Exception in Future <Task finished coro=<BaseHandler.spawn_single_user..finish_user_spawn() done, defined at /share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/handlers/base.py:845> exception=TimeoutError(“Server at 127.0.0.1:60752/user/test/ didn’t respond in 30 seconds”,)> after timeout
Traceback (most recent call last):
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/tornado/gen.py”, line 593, in error_callback
future.result()
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/handlers/base.py”, line 852, in finish_user_spawn
await spawn_future
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/user.py”, line 668, in spawn
await self._wait_up(spawner)
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/user.py”, line 715, in _wait_up
raise e
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/user.py”, line 683, in _wait_up
http=True, timeout=spawner.http_timeout, ssl_context=ssl_context
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/utils.py”, line 234, in wait_for_http_server
timeout=timeout,
File “/share/apps/platform/ai/py36/3_6_8/lib/python3.6/site-packages/jupyterhub/utils.py”, line 177, in exponential_backoff
raise TimeoutError(fail_message)
TimeoutError: Server at 127.0.0.1:60752/user/test/ didn’t respond in 30 seconds

[I 2020-03-16 18:51:23.115 JupyterHub log:174] 200 GET /hub/api/users/test/server/progress (test@192.168.1.118) 28535.10ms

Finally i am getting on web page as below:

100% Complete

Spawn failed: Server at http://127.0.0.1:60752/user/test/ didn’t respond in 30 seconds

Please help me resolve this issue.

regards,
Zain