Exception while executing migrate.py

[poojakashyap121]

Description

I get the exception whenever I try executing migrate.py, exactly as given on [http://dev.grakn.ai/docs/examples/phone-calls-migration-python].

Environment

1. OS (where Grakn server runs): Mac OS 10
2. Grakn version (and platform): Grakn Core 1.6
3. Grakn client: client-python
4. Other environment details:

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. install Grakn and run the server
2. Upload the schema on grakn
3. run the code for migrate.py for JSON formatted dataset
   as given on [http://dev.grakn.ai/docs/examples/phone-calls-migration-python]

Expected Output

Python script to execute with no errors and exceptions.

Actual Output

Traceback (most recent call last):
File "/anaconda3/lib/python3.6/site-packages/grakn/client.py", line 63, in init
open_session_response = self._stub.open(RequestBuilder.open_session(keyspace, self.credentials))
File "/anaconda3/lib/python3.6/site-packages/grpc/_channel.py", line 533, in call
return _end_unary_response_blocking(state, call, False, None)
File "/anaconda3/lib/python3.6/site-packages/grpc/_channel.py", line 467, in _end_unary_response_blocking
raise _Rendezvous(state, None, None, deadline)
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "Connect Failed"
debug_error_string = "{"created":"@1582107100.501949000","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2721,"referenced_errors":[{"created":"@1582107100.501946000","description":"Pick Cancelled","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":241,"referenced_errors":[{"created":"@1582107100.501915000","description":"Connect Failed","file":"src/core/ext/filters/client_channel/subchannel.cc","file_line":689,"grpc_status":14,"referenced_errors":[{"created":"@1582107100.501898000","description":"Failed to connect to remote host: OS Error","errno":61,"file":"src/core/lib/iomgr/tcp_client_posix.cc","file_line":205,"os_error":"Connection refused","syscall":"connect","target_address":"ipv4:127.0.0.1:48555"}]}]}]}"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "migrate.py", line 223, in
build_phone_call_graph(inputs=Inputs, data_path="../../datasets/phone-calls/", keyspace_name = "phone_calls")
File "migrate.py", line 113, in build_phone_call_graph
with client.session(keyspace=keyspace_name) as session: # 2
File "/anaconda3/lib/python3.6/site-packages/grakn/client.py", line 23, in session
return Session(self.uri, keyspace, self._channel, self.credentials)
File "/anaconda3/lib/python3.6/site-packages/grakn/client.py", line 66, in init
raise GraknError('Could not obtain sessionId for keyspace "{0}", stems from: {1}'.format(keyspace, e))
grakn.exception.GraknError.GraknError: Could not obtain sessionId for keyspace "phone_calls", stems from: <_Rendezvous of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "Connect Failed"
debug_error_string = "{"created":"@1582107100.501949000","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2721,"referenced_errors":[{"created":"@1582107100.501946000","description":"Pick Cancelled","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":241,"referenced_errors":[{"created":"@1582107100.501915000","description":"Connect Failed","file":"src/core/ext/filters/client_channel/subchannel.cc","file_line":689,"grpc_status":14,"referenced_errors":[{"created":"@1582107100.501898000","description":"Failed to connect to remote host: OS Error","errno":61,"file":"src/core/lib/iomgr/tcp_client_posix.cc","file_line":205,"os_error":"Connection refused","syscall":"connect","target_address":"ipv4:127.0.0.1:48555"}]}]}]}"
>

Additional information

I have installed Grakn manually.