Unexpected exception during accept: 'NoneType' object has no attribute 'get_name' closing

[Muna24]

Hello

I reached the part
From modeled YANG modules to a NETCONF service
in the readme file
and I receive these errors:

• from the server side:
  NetconfSSHServer(port=12345): Unexpected exception during accept: 'NoneType' object has no attribute 'get_name' closing

• from the client side:
  Exception: Error reading SSH protocol banner
  Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 2138, in _check_banner
  buf = self.packetizer.readline(timeout)
  File "/usr/local/lib/python3.6/dist-packages/paramiko/packet.py", line 367, in readline
  buf += self._read_timeout(timeout)
  File "/usr/local/lib/python3.6/dist-packages/paramiko/packet.py", line 576, in _read_timeout
  raise socket.timeout()
  socket.timeout

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 1966, in run
self._check_banner()
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 2143, in _check_banner
"Error reading SSH protocol banner" + str(e)
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner

Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 2138, in _check_banner
buf = self.packetizer.readline(timeout)
File "/usr/local/lib/python3.6/dist-packages/paramiko/packet.py", line 367, in readline
buf += self._read_timeout(timeout)
File "/usr/local/lib/python3.6/dist-packages/paramiko/packet.py", line 576, in _read_timeout
raise socket.timeout()
socket.timeout

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "", line 2, in
File "/usr/local/lib/python3.6/dist-packages/netconf/client.py", line 429, in init
host, port, "netconf", username, password, debug, cache=cache, proxycmd=proxycmd)
File "/usr/local/lib/python3.6/dist-packages/sshutil/conn.py", line 158, in init
proxycmd)
File "/usr/local/lib/python3.6/dist-packages/sshutil/conn.py", line 75, in init
self.ssh = cache.get_ssh_socket(host, port, username, password, debug, proxycmd)
File "/usr/local/lib/python3.6/dist-packages/sshutil/cache.py", line 334, in get_ssh_socket
True, debug, proxycmd)
File "/usr/local/lib/python3.6/dist-packages/sshutil/cache.py", line 147, in _open_ssh_socket
sshsock.start_client(event)
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 587, in start_client
raise e
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 1966, in run
self._check_banner()
File "/usr/local/lib/python3.6/dist-packages/paramiko/transport.py", line 2143, in _check_banner
"Error reading SSH protocol banner" + str(e)
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner

( as a summary of what I have done: I create a linux (lxc) container, os = ubuntu bionic, I install both netconf and modeled.netconf) and I follow what is given in the readme file

Any clues on how I can solve the problems?

Thanks in advance