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I installed YouCompleteMe (--clang-completer), but cannot use it. On start I see a message

The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). Unexpected exit code -11. Use the ':YcmToggleLogs
' command to check the logs.
  • :YcmRestartServer. I've got a message Restarting ycmd server... and nothing happens. The message is showed a long time and disappeared just when I input :. YCM still doesn't work.

  • :YcmDiags shows message Native filetype completion not supported for current file, cannot force recompilation. This is c++ hello world application (*.cpp or *.cxx)

  • :YcmDebugInfo shows a message

     Printing YouCompleteMe debug information...
     -- Client logfile: /tmp/ycm_642rzu.log
     -- Server errored, no debug info from server
     -- Server running at: http://127.0.0.1:56271
     -- Server process ID: 10184
     -- Server logfiles:
     --   /tmp/ycmd_56271_stdout_6djrrG.log
     --   /tmp/ycmd_56271_stderr_3G61Dj.log
    

    The last two logs are empty files.
    File /tmp/ycm_642rzu.log includes a lot of ConnectTimeout errors similar to each other like the following:

     2017-02-26 22:47:12,994 - ERROR - Unable to connect to server
     Traceback (most recent call last):
       File "/home/loom/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 196, in HandleServerException
         yield
       File "/home/loom/.vim/bundle/YouCompleteMe/autoload/../python/ycm/youcompleteme.py", line 350, in ServerBecomesReady
         'ready' )
       File "/home/loom/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 74, in GetDataFromHandler
         timeout ) )
       File "/home/loom/.vim/bundle/YouCompleteMe/autoload/../python/ycm/client/base_request.py", line 162, in JsonFromFuture
         response = future.result()
       File "/home/loom/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 404, in result
         return self.__get_result()
       File "/home/loom/.vim/bundle/YouCompleteMe/third_party/pythonfutures/concurrent/futures/_base.py", line 356, in __get_result
         raise self._exception
     ConnectTimeout: HTTPConnectionPool(host='127.0.0.1', port=56271): Max retries exceeded with url: /ready (Caused by ConnectTimeoutError(<requests.packages.urllib3.connection.HTTPConnection object at 0x6fffeef4810>, 'Connection to 127.0.0.1 timed out. (connect timeout=0.01)'))
    

How can I fix YCM?

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