Error in training -------ZMQError: Address already in use

[gothic22]

hi,
every time i train a model, after some epochs, this error occurs:

Traceback (most recent call last):
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/spyder_kernels/console/main.py", line 11, in
start.main()
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/spyder_kernels/console/start.py", line 306, in main
kernel.initialize()
File "", line 2, in initialize
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/traitlets/config/application.py", line 87, in catch_config_error
return method(app, *args, **kwargs)
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/ipykernel/kernelapp.py", line 567, in initialize
self.init_sockets()
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/ipykernel/kernelapp.py", line 271, in init_sockets
self.shell_port = self._bind_socket(self.shell_socket, self.shell_port)
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/ipykernel/kernelapp.py", line 218, in _bind_socket
return self._try_bind_socket(s, port)
File "/home/thu‑microe/anaconda3/envs/tensorflow/lib/python3.6/site‑packages/ipykernel/kernelapp.py", line 194, in _try_bind_socket
s.bind("tcp://%s:%i" % (self.ip, port))
File "zmq/backend/cython/socket.pyx", line 547, in zmq.backend.cython.socket.Socket.bind
File "zmq/backend/cython/checkrc.pxd", line 25, in zmq.backend.cython.checkrc._check_rc
zmq.error.ZMQError: Address already in use.

can you help, thanks