Why does my YCM Server shut down?

Question

Whenever I open vim, I get the message that Ycm Server has shutdown with exit code -6. The log files contain the following info:

2017-12-23 21:25:50,550 - ERROR - Unable to connect to server
Traceback (most recent call last):
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 217, in HandleServerException
    yield
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/youcompleteme.py", line 237, in CheckIfServerIsReady
    'ready' )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 68, in GetDataFromHandler
    timeout ) )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 183, in JsonFromFuture
    response = future.result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 404, in result
    return self.__get_result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 356, in __get_result
    raise self._exception
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=54499): Max retries exceeded with url: /ready (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x10b7cbd50>: Failed to establish a new connection: [Errno 61] Connection refused',))
2017-12-23 21:25:50,655 - ERROR - The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). Unexpected exit code -6. Type ':YcmToggleLogs ycmd_54499_stderr_MqYNI6.log' to check the logs.
2017-12-23 21:26:05,494 - ERROR - Unable to connect to server
Traceback (most recent call last):
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 217, in HandleServerException
    yield
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/shutdown_request.py", line 37, in Start
    self.PostDataToHandler( {}, 'shutdown', TIMEOUT_SECONDS )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 78, in PostDataToHandler
    timeout ) )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 183, in JsonFromFuture
    response = future.result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 404, in result
    return self.__get_result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 356, in __get_result
    raise self._exception
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=54499): Max retries exceeded with url: /shutdown (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x10b80d2d0>: Failed to establish a new connection: [Errno 61] Connection refused',))
2017-12-23 21:26:05,618 - ERROR - Unable to connect to server
Traceback (most recent call last):
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 217, in HandleServerException
    yield
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/youcompleteme.py", line 237, in CheckIfServerIsReady
    'ready' )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 68, in GetDataFromHandler
    timeout ) )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 183, in JsonFromFuture
    response = future.result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 404, in result
    return self.__get_result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 356, in __get_result
    raise self._exception
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=54502): Max retries exceeded with url: /ready (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x10b80d650>: Failed to establish a new connection: [Errno 61] Connection refused',))
2017-12-23 21:26:05,721 - ERROR - The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). Unexpected exit code -6. Type ':YcmToggleLogs ycmd_54502_stderr_fNX8sk.log' to check the logs.
2017-12-23 21:26:14,523 - ERROR - Unable to connect to server
Traceback (most recent call last):
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 217, in HandleServerException
    yield
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/debug_info_request.py", line 41, in Start
    self._response = self.PostDataToHandler( request_data, 'debug_info' )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 78, in PostDataToHandler
    timeout ) )
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 183, in JsonFromFuture
    response = future.result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 404, in result
    return self.__get_result()
  File "/Users/abhisheknaik/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 356, in __get_result
    raise self._exception
ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=54502): Max retries exceeded with url: /debug_info (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x10b80da10>: Failed to establish a new connection: [Errno 61] Connection refused',))

Could someone please point out why is the connection lost? Running YcmRestartServer does not help as the server shuts down again.

Would highly appreciate any help. Thanks!

Put let g:ycm_server_keep_logfiles = 1 let g:ycm_server_log_level = 'debug' in your .vimrc. Use :YcmDebugInfo to see where the logs are kept, and read them. Post the output if the solution isn't obvious. — Qwertycrackers
@Qwertycrackers, that's what I have done above. I got the log details (posted above) after following the exact steps that you mention. — user6490375
Whoops, didn't read as closely as I should. I can't find this exact error anywhere, but I can't help but suspect it might stem from not having the proper libclang available to the ycmd server. Can you check if the one you are using (probably system) has version greater than 3.2? — Qwertycrackers
It also looks like this guy experienced a similar problem but there doesn't appear to be more info. — Qwertycrackers

aris aris · Accepted Answer · 2019-07-06T21:00:10

You can try updating YouCompleteMe. If using vim-plug:

:PlugUpdate YouCompleteMe

It worked for me.

Why does my YCM Server shut down?

1 Answers