ydk.errors.YServiceProviderError:  RPC error occurred; check log for details

Traceback (most recent call last):
  File "/Users/ygorelik/gitlab/ydk-gen/scripts/tests/get_schema.py", line 21, in <module>
    es.execute_rpc(ncc, rpc)
  File "/Users/ygorelik/venv/lib/python3.7/site-packages/ydk/services/executor_service.py", line 32, in execute_rpc
    return self._es.execute_rpc(provider, entity, top_entity)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "/Users/ygorelik/venv/lib/python3.7/site-packages/ydk/errors/error_handler.py", line 82, in handle_runtime_error
    _raise(_exc)
  File "/Users/ygorelik/venv/lib/python3.7/site-packages/ydk/errors/error_handler.py", line 54, in _raise
    exec("raise exc from None")
  File "<string>", line 1, in <module>
ydk.errors.YServiceProviderError:  RPC error occurred; check log for details

from ydk.providers import NetconfServiceProvider
from ydk.services import ExecutorService
from ydk.models.ietf import ietf_netconf_monitoring as ietf
from test_utils import enable_logging

import logging

if __name__ == '__main__':

    enable_logging(logging.INFO)

    ncc = NetconfServiceProvider(
        address='127.0.0.1',
        username='admin',
        password='admin',
        port=12022)

    rpc = ietf.GetSchema()
    rpc.input.identifier = 'ietf-netconf'
    es = ExecutorService()
    es.execute_rpc(ncc, rpc)