Failed to start the WebSocket server. Traceback (most recent call last): File "/usr/lib/python3.5/asyncio/base_events.py", line 958, in create_server sock.bind(sa) OSError: [Errno 98] Address already in use During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/opt/superdesk/env/lib/python3.5/site-packages/superdesk/websockets_comms.py", line 269, in run_server self.host, self.port)) File "/usr/lib/python3.5/asyncio/base_events.py", line 387, in run_until_complete return future.result() File "/usr/lib/python3.5/asyncio/futures.py", line 274, in result raise self._exception File "/usr/lib/python3.5/asyncio/tasks.py", line 239, in _step result = coro.send(None) File "/opt/superdesk/env/lib/python3.5/site-packages/websockets/server.py", line 356, in serve server = yield from loop.create_server(factory, host, port, **kwds) File "/usr/lib/python3.5/asyncio/base_events.py", line 962, in create_server % (sa, err.strerror.lower())) OSError: [Errno 98] error while attempting to bind on address ('0.0.0.0', 5100): address already in use During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/opt/superdesk/env/lib/python3.5/site-packages/superdesk/ws.py", line 30, in create_server comms.run_server() File "/opt/superdesk/env/lib/python3.5/site-packages/superdesk/websockets_comms.py", line 282, in run_server server.close() UnboundLocalError: local variable 'server' referenced before assignment