Javascript RNDocumentPicker:本机模块不可用

我完全按照这里描述的方向操作（），但它不起作用。我得到这个错误：

RNDocumentPicker: Native module is not available, make sure you have finished the installation process and rebuilt your app


Error: not opened
at WebSocket.send (/Users/miajohansson/Desktop/bnook/node_modules/ws/lib/WebSocket.js:219:16)
at send (/Users/miajohansson/Desktop/bnook/node_modules/react-native/local-cli/server/util/webSocketProxy.js:26:12)
at WebSocket.debuggerSocket.onmessage (/Users/miajohansson/Desktop/bnook/node_modules/react-native/local-cli/server/util/webSocketProxy.js:48:48)
at WebSocket.onMessage (/Users/miajohansson/Desktop/bnook/node_modules/ws/lib/WebSocket.js:442:14)
at emitTwo (events.js:126:13)
at WebSocket.emit (events.js:214:7)
at Receiver.ontext (/Users/miajohansson/Desktop/bnook/node_modules/ws/lib/WebSocket.js:841:10)
at /Users/miajohansson/Desktop/bnook/node_modules/ws/lib/Receiver.js:536:18
at /Users/miajohansson/Desktop/bnook/node_modules/ws/lib/Receiver.js:368:7
at /Users/miajohansson/Desktop/bnook/node_modules/ws/lib/PerMessageDeflate.js:249:5

当我在代码（如下）中添加DocumentPicker时，我得到一个TypeError：无法读取已定义的属性“show”

import { DocumentPicker, DocumentPickerUtil } from 'react-native-document-picker';

// iPhone/Android
DocumentPicker.show({
      filetype: [DocumentPickerUtil.images()],
    },(error,res) => {
      // Android
      console.log(
         res.uri,
         res.type, // mime type
         res.fileName,
         res.fileSize
      );
    });

---

我已删除节点模块并运行npm安装，但仍然出现此错误。

请确定您是npm还是yarn，安装未完成。尝试重做

添加react本机文档选择器--保存

或

npm安装react本机文档选择器--保存