I'm trying to start using Ethereum Web3.js with node 6.11.1 on a macosx

I installed web3 with the following command:

npm install web3

Then i launch this - apparently - simple node command:

Web3 = require('web3');

Well, it returns the following error:

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.<anonymous> (/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)

it looks like it require some module (e.g. 'web3-requestManager') that aren't installed with the package.

Here it is my 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

}

Any Idea? Am i doing something wrong?