             command: 'error',
             payload:
               message: 'Requested graph not found'
+              stack: String
           ]
           receive expects, done
           send 'graph', 'addnode',

            command: 'error',
            payload:
              message: 'No graph specified'
          ]
          receive expects, done
          send 'graph', 'addnode',

            payload:
              type: runtimeType
              version: version
              graph: String
              capabilities: Array
              allCapabilities: Array
          ]
