always tips :
module.js:341
throw err;
^
Error: Cannot find module 'core-js/library/fn/symbol/iterator'
at Function.Module._resolveFilename (module.js:339:15)
at Function.Module._load (module.js:290:25)
at Module.require (module.js:367:17)
at require (internal/module.js:16:19)
at Object.<anonymous> (/Users/ufo/workspaces/babel-starter-kit/node_modules/.npminstall/babel-runtime/6.6.1/babel-runtime/core-js/symbol/iterator.js:1:93)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Module.require (module.js:367:17)
---
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always tips :