undefined is not… ‘RCTWebSocketManager.connect’

  node.js, question

To integrate React Native into an iOS empty project in inside, the following error occurred in the operation times:

The operation of the terminal:

Xcode reported such an error:

2016-06-28 15:32:59.030 [warn][tid:com.facebook.React.JavaScript] 'Warning: Native component for "RCTImageView" does not exist'
 2016-06-28 15:32:59.098 [info][tid:com.facebook.React.JavaScript] 'Running application "SimpleApp" with appParams: {"rootTag":1,  "initialProps":{}}. __DEV__ === true, development-level warning are ON, performance optimizations are OFF'
 2016-06-28 15:32:59.102 [warn][tid:com.facebook.React.JavaScript] 'Error: undefined is not an object (evaluating \'RCTWebSocketManager.connect\')\  n stack: \n  connectToSocketImpl  index.ios.bundle:14536\n  WebSocketBase        index.ios.bundle:14659\  n  WebSocket            index.ios.bundle:14530\n  setupDevtools        index.ios.bundle:46258\n  renderApplication    index.ios.bundle:44601\  n  run                  index.ios.bundle:44493\n  runApplication       index.ios.bundle:44521\n  __callFunction       index.ios.bundle:5534\  n  <unknown>            index.ios.bundle:5470\n  guard                index.ios.bundle:5423\n  <unknown>            index.ios.bundle:5470\  n  <unknown>            index.ios.bundle:5467\n  perform              index.ios.bundle:7012\n  batchedUpdates       index.ios.bundle:16526\  n  batchedUpdates       index.ios.bundle:6315\n  <unknown>            index.ios.bundle:5466\n  guard                index.ios.bundle:5423\  n  processBatch         index.ios.bundle:5465\n URL: http://localhost:8081/index.ios.bundle\n line: 14536\n message: undefined is not an object (evaluating \'RCTWebSocketManager.connect\')'
 2016-06-28 15:32:59.104 [warn][tid:com.facebook.React.JavaScript] 'Unable to load source map: RCTNetworking module is not available'

Do you have any great gods to help you?

pod ‘React’
pod ‘React’, :subspecs => [