For a few days now I always getting the following error when pressing any key in vim:Error detected while processing function <SNR>53_OnCursorMovedNormalMode[5]..<SNR>53_OnFileReadyToParse:Traceback (most recent call last):  File <string>, line 1, in <module>  File /usr/share/vim-youcompleteme/python/ycm/youcompleteme.py, line 508, in HandleFileParseRequest    self.NativeFiletypeCompletionUsable() ):  File /usr/share/vim-youcompleteme/python/ycm/youcompleteme.py, line 255, in NativeFiletypeCompletionUsable    self.NativeFiletypeCompletionAvailable() )  File /usr/share/vim-youcompleteme/python/ycm/youcompleteme.py, line 250, in NativeFiletypeCompletionAvailable    vimsupport.CurrentFiletypes() ] )  File /usr/share/vim-youcompleteme/python/ycm/youcompleteme.py, line 249, in <listcomp>    return any( [ self.FiletypeCompleterExistsForFiletype( x ) for x in  File /usr/share/vim-youcompleteme/python/ycm/youcompleteme.py, line 240, in FiletypeCompleterExistsForFiletype    exists_completer = SendCompleterAvailableRequest( filetype )  File /usr/share/vim-youcompleteme/python/ycm/client/completer_available_request.py, line 57, in SendCompleterAvailableRequest    request.Start()  File /usr/share/vim-youcompleteme/python/ycm/client/completer_available_request.py, line 45, in Start    'semantic_completion_available' )  File /usr/share/vim-youcompleteme/python/ycm/client/base_request.py, line 81, in PostDataToHandler    timeout ) )  File /usr/share/vim-youcompleteme/python/ycm/client/base_request.py, line 174, in JsonFromFuture    _ValidateResponseObject( response )  File /usr/share/vim-youcompleteme/python/ycm/client/base_request.py, line 203, in _ValidateResponseObject    their_hmac = ToBytes( b64decode( response.headers[ _HMAC_HEADER ] ) )  File /usr/lib/python3/dist-packages/requests/structures.py, line 54, in __getitem__    return self._store[key.lower()][1]KeyError: 'x-ycm-hmac'I'm using vim on Ubuntu 16.04 with the official vim-youcompleteme package.There are questions with the same problem on stackoverflow here and here, unfortunately without answers.
youcompleteme key error when using vim
plugin you complete me