找不到模块“gulp sass”

嗨,我正在试着吞咽,每次我都会遇到这个错误。

10:15:04 portfolio$~gulp
module.js:549
    throw err;
    ^

Error: Cannot find module 'gulp-sass'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/andynguyen/Desktop/Portfolio/gulpfile.js:3:12)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)

我已经尝试过npm安装,sudo npm安装--保存gulp sass和sudo npm安装-g gulp sass。当我尝试全局安装文件时,我得到

gyp ERR! configure error 
gyp ERR! stack Error: EACCES: permission denied, mkdir '/Users/andynguyen/Desktop/Portfolio/node_modules/node-sass/build'
gyp ERR! System Darwin 17.5.0
gyp ERR! command "/usr/local/bin/node" "/Users/andynguyen/Desktop/Portfolio/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd /Users/andynguyen/Desktop/Portfolio/node_modules/node-sass
gyp ERR! node -v v8.11.1
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok 

我的节点版本是最近的吗?