Missing six module at runtime (Use SQLFlow-in-a-VM)

[bob001]

An exception occurred when I ran the demo using jupyter. Please help to check the reason.

%%sqlflow
describe iris.train;

_MultiThreadedRendezvous Traceback (most recent call last)
in
----> 1 get_ipython().run_cell_magic('sqlflow', '', 'describe iris.train;\n')

/usr/lib/python3.8/site-packages/IPython/core/interactiveshell.py in run_cell_magic(self, magic_name, line, cell)
2357 with self.builtin_trap:
2358 args = (magic_arg_s, cell)
-> 2359 result = fn(*args, **kwargs)
2360 return result
2361

in execute(self, line, cell)

/usr/lib/python3.8/site-packages/IPython/core/magic.py in (f, *a, **k)
185 # but it's overkill for just that one bit of state.
186 def magic_deco(arg):
--> 187 call = lambda f, *a, **k: f(*a, **k)
188
189 if callable(arg):

/usr/lib/python3.8/site-packages/sqlflow/magic.py in execute(self, line, cell)
43
44 """
---> 45 return self.client.execute('\n'.join([line, cell]))
46
47 def load_ipython_extension(ipython):

/usr/lib/python3.8/site-packages/sqlflow/client.py in execute(self, operation)
147 # NOTE: raise exception to interrupt notebook execution. Or
148 # the notebook will continue execute the next block.
--> 149 raise e
150 except EnvExpanderError as e:
151 raise e

/usr/lib/python3.8/site-packages/sqlflow/client.py in execute(self, operation)
143 try:
144 stream_response = self._stub.Run(self.sql_request(operation), timeout=DEFAULT_TIMEOUT)
--> 145 return self.display(stream_response)
146 except grpc.RpcError as e:
147 # NOTE: raise exception to interrupt notebook execution. Or

/usr/lib/python3.8/site-packages/sqlflow/client.py in display(self, stream_response)
206 """Display stream response like log or table.row"""
207 reader = StreamReader(stream_response)
--> 208 response, rtype = reader.read_one()
209 compound_message = CompoundMessage()
210 while True:

/usr/lib/python3.8/site-packages/sqlflow/client.py in read_one(self)
35 def read_one(self):
36 try:
---> 37 res = next(self._stream_response)
38 except StopIteration:
39 return (None, None)

/usr/lib/python3.8/site-packages/grpc/_channel.py in next(self)
414
415 def next(self):
--> 416 return self._next()
417
418 def _next(self):

/usr/lib/python3.8/site-packages/grpc/_channel.py in _next(self)
704 raise StopIteration()
705 elif self._state.code is not None:
--> 706 raise self
707
708

_MultiThreadedRendezvous: <_MultiThreadedRendezvous of RPC that terminated with:
status = StatusCode.UNKNOWN
details = "failed /usr/local/bin/python /tmp/sqlflow.py155989687, exit status 1 Traceback (most recent call last):
File "/tmp/sqlflow.py155989687", line 5, in
import couler.argo as couler
File "/usr/lib/python3.8/site-packages/couler/init.py", line 14, in
from couler.argo import * # noqa: F401, F403
File "/usr/lib/python3.8/site-packages/couler/argo.py", line 19, in
from kubernetes import client as k8s_client
File "/usr/lib/python3.8/site-packages/kubernetes/init.py", line 19, in
import kubernetes.client
File "/usr/lib/python3.8/site-packages/kubernetes/client/init.py", line 20, in
from kubernetes.client.api.admissionregistration_api import AdmissionregistrationApi
File "/usr/lib/python3.8/site-packages/kubernetes/client/api/init.py", line 6, in
from kubernetes.client.api.admissionregistration_api import AdmissionregistrationApi
File "/usr/lib/python3.8/site-packages/kubernetes/client/api/admissionregistration_api.py", line 18, in
import six
ModuleNotFoundError: No module named 'six'
"
debug_error_string = "{"created":"@1622862257.616662127","description":"Error received from peer ipv4:127.0.0.1:50051","file":"src/core/lib/surface/call.cc","file_line":1056,"grpc_message":"failed /usr/local/bin/python /tmp/sqlflow.py155989687, exit status 1 Traceback (most recent call last):\n File "/tmp/sqlflow.py155989687", line 5, in \n import couler.argo as couler\n File "/usr/lib/python3.8/site-packages/couler/init.py", line 14, in \n from couler.argo import * # noqa: F401, F403\n File "/usr/lib/python3.8/site-packages/couler/argo.py", line 19, in \n from kubernetes import client as k8s_client\n File "/usr/lib/python3.8/site-packages/kubernetes/init.py", line 19, in \n import kubernetes.client\n File "/usr/lib/python3.8/site-packages/kubernetes/client/init.py", line 20, in \n from kubernetes.client.api.admissionregistration_api import AdmissionregistrationApi\n File "/usr/lib/python3.8/site-packages/kubernetes/client/api/init.py", line 6, in \n from kubernetes.client.api.admissionregistration_api import AdmissionregistrationApi\n File "/usr/lib/python3.8/site-packages/kubernetes/client/api/admissionregistration_api.py", line 18, in \n import six\nModuleNotFoundError: No module named 'six'\n","grpc_status":2}"