以太坊web3.js返回不能找到模块web3-requestManager？

以太坊web3.js返回不能找到模块web3-requestManager？错误信息如下：

Cannot find module 'web3-requestManager'

我用下面命令安装web3：

npm install web3

然后我启动了node.js的命令，很简单的:

Web3 = require('web3');

马上返回一个错误信息：

module.js:471 throw err; ^

Error: Cannot find module 'web3-requestManager' at Function.Module._resolveFilename (module.js:469:15) at Function.Module._load (module.js:417:25) at Module.require (module.js:497:17) at require (internal/module.js:20:19) at Object. (/Users/fremente/Dropbox/Influx Design/Web htdocs/ethereum/node_modules/web3/packages/web3-core/src/index.js:26:22) at Module._compile (module.js:570:32) at Object.Module._extensions..js (module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad (module.js:446:12) at Function.Module._load (module.js:438:3)

看起来它需要一些没有安装包的模块(如web3-requestManager)。

这是我的package.json:

{ "name": "ethereum", "version": "1.0.0", "description": "", "main": "index.js", "dependencies": { "ethereumjs-testrpc": "^4.0.1", "solc": "^0.4.13", "web3": "^1.0.0-beta2" }, "devDependencies": {}, "scripts": { "test": "echo "Error: no test specified" && exit 1" }, "author": "", "license": "ISC" }