Error: Cannot find module './lib/getenv'

I am trying to build an expo app on Mac os.
node version : v11.13.0
npm version : 6.7.0

I installed expo with this command “npm install -g expo-cli”
When I input “expo” command on terminal it shows like below.

throw err;

Error: Cannot find module ‘./lib/getenv’
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:655:15)
at Function.Module._load (internal/modules/cjs/loader.js:580:25)
at Module.require (internal/modules/cjs/loader.js:711:19)
at require (internal/modules/cjs/helpers.js:14:16)
at Object. (/usr/local/lib/node_modules/expo-cli/node_modules/getenv/index.js:1:18)
at Module._compile (internal/modules/cjs/loader.js:805:30)
at Object.Module._extensions…js (internal/modules/cjs/loader.js:816:10)
at Module.load (internal/modules/cjs/loader.js:672:32)
at tryModuleLoad (internal/modules/cjs/loader.js:612:12)
at Function.Module._load (internal/modules/cjs/loader.js:604:3)

To solve this problem, I installed getenv module with “npm install -g getenv” but not solved.
Does anybody know how to fix it?

Did you fix the problem??

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