ConnectionRefusedError: [Errno 111] Connection refused

[HodaMemar]

Hi
I have some problem
after install jsonrpclib and pycorenlp
I try :
!python /content/clneg/src/main.py /content/clneg/data/dev.txt
and I get the connection error:

Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/urllib3/connection.py", line 159, in _new_conn
(self._dns_host, self.port), self.timeout, **extra_kw)
File "/usr/local/lib/python3.7/dist-packages/urllib3/util/connection.py", line 80, in create_connection
raise err
File "/usr/local/lib/python3.7/dist-packages/urllib3/util/connection.py", line 70, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

What can I do?