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, Thresholds) when NumOfErrors >= Thresholds ->
      State = ?STATE_STOP,
      Cause = "could not modify storage status",
  
      case leo_manager_mnesia:update_storage_node_status(
             update_state, #node_state{node  = Node,
  
negative.code:                             notify1(error, Node, NumOfErrors, Size)
                      end;
                  _ ->
                      {error, ?ERROR_COULD_NOT_MODIFY_STORAGE_STATE}
              end;
          _Error ->
              {error, ?ERROR_COULD_NOT_MODIFY_STORAGE_STATE}
      end;
  
  notify(synchronized, VNodeId, Node) ->
  