anchor.diff:                              notify1(error, Node, NumOfErrors, Size)
                       end;
                   _ ->
  -                    {error, "could not modify storage status"}
  +                    {error, ?ERROR_COULD_NOT_MODIFY_STORAGE_STATE}
               end;
           _Error ->
  -            {error, "could not modify storage status"}
  +            {error, ?ERROR_COULD_NOT_MODIFY_STORAGE_STATE}
       end;
   
   notify(synchronized, VNodeId, Node) ->
  
positive.code:                                 end, [], R1),
              rpc:multicall(Nodes, leo_gateway_api, purge, [Path], ?DEF_TIMEOUT),
              ok;
          _ ->
              {error, "could not get gateway-nodes"}
      end.
  
  %% @doc
  
negative.code: 
  -type(system_status() :: ?STATE_RUNNING | ?STATE_STOP).
  
  -define(ERROR_COULD_NOT_MODIFY_STORAGE_STATE, "Could not modify the storage status").
  -define(ERROR_COULD_NOT_GET_GATEWAY,          "Could not get gateway nodes").
  -define(ERROR_COULD_NOT_GET_RTABLE_CHKSUM,    "Could not get a routing talble checksum").
  -define(ERROR_META_NOT_FOUND,                 "Metadata not found").
  
  
  %%----------------------------------------------------------------------
  %% API-Function(s) - retrieve system information.
  