anchor.diff:                                  end, [], R1),
               rpc:multicall(Nodes, leo_gateway_api, purge, [Path], ?DEF_TIMEOUT),
               ok;
  -        _ ->
  -            {error, "could not get gateway-nodes"}
  +        _Error ->
  +            {error, ?ERROR_COULD_NOT_GET_GATEWAY}
       end.
   
   %% @doc
  
positive.code:                             notify1(error, Node, NumOfErrors, Size)
                      end;
                  _ ->
                      {error, "could not modify storage status"}
              end;
          _Error ->
              {error, "could not modify storage status"}
      end;
  
  notify(synchronized, VNodeId, Node) ->
  
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.
  