Error: Cannot find module 'puppeteer'

[BibiBabiBobi]

when I run "pyspider", get error:
internal/modules/cjs/loader.js:985
throw err;
^

Error: Cannot find module 'puppeteer'
Require stack:

• /usr/local/lib/python2.7/site-packages/pyspider-0.4.0-py2.7.egg/pyspider/fetcher/puppeteer_fetcher.js
  at Function.Module._resolveFilename (internal/modules/cjs/loader.js:982:15)
  at Function.Module._load (internal/modules/cjs/loader.js:864:27)
  at Module.require (internal/modules/cjs/loader.js:1044:19)
  at require (internal/modules/cjs/helpers.js:77:18)
  at Object. (/usr/local/lib/python2.7/site-packages/pyspider-0.4.0-py2.7.egg/pyspider/fetcher/puppeteer_fetcher.js:2:19)
  at Module._compile (internal/modules/cjs/loader.js:1158:30)
  at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
  at Module.load (internal/modules/cjs/loader.js:1002:32)
  at Function.Module._load (internal/modules/cjs/loader.js:901:14)
  at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
  '/usr/local/lib/python2.7/site-packages/pyspider-0.4.0-py2.7.egg/pyspider/fetcher/puppeteer_fetcher.js'
  ]
  }