anchor.diff:          [] ->
               {error, ?ERROR_INVALID_PATH};
           [Key|_] ->
  -            case leo_manager_api:purge(Key) of
  -                ok ->
  -                    ok;
  -                {error, Cause} ->
  -                    {error, Cause}
  -            end
  +            leo_manager_api:purge(Key)
       end.
   
   
  
positive.code:         [] ->
              {error, ?ERROR_INVALID_PATH};
          [Node|_] ->
              case leo_manager_api:remove(Node) of
                  ok ->
                      ok;
                  {error, Cause} ->
                      {error, Cause}
              end
      end.
  
  
  
negative.code:                 {ok, #member{state = ?STATE_RUNNING}} ->
                      {error, "Already running"};
                  {ok, #member{state = ?STATE_DETACHED}} ->
                      leo_manager_api:rollback(NodeAtom);
                  _ ->
                      {error, ?ERROR_COULD_NOT_ROLLBACK}
              end
  