NPM run watch-poll 和 NPM run dev 前面几天还能用的，现在突然报错了，怎么办？

报错1：
vagrant@homestead:~$ npm run watch-poll
npm ERR! Linux 4.4.0-81-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "watch-poll"
npm ERR! node v6.11.1
npm ERR! npm v3.10.10
npm ERR! path /home/vagrant/package.json
npm ERR! code ENOENT
npm ERR! errno -2
npm ERR! syscall open

npm ERR! enoent ENOENT: no such file or directory, open '/home/vagrant/package.json'
npm ERR! enoent ENOENT: no such file or directory, open '/home/vagrant/package.json'
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! Please include the following file with any support request:
npm ERR! /home/vagrant/npm-debug.log
报错2：
vagrant@homestead:~$ npm run dev
npm ERR! Linux 4.4.0-81-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "dev"
npm ERR! node v6.11.1
npm ERR! npm v3.10.10
npm ERR! path /home/vagrant/package.json
npm ERR! code ENOENT
npm ERR! errno -2
npm ERR! syscall open

npm ERR! enoent ENOENT: no such file or directory, open '/home/vagrant/package.json'
npm ERR! enoent ENOENT: no such file or directory, open '/home/vagrant/package.json'
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! Please include the following file with any support request:
npm ERR! /home/vagrant/npm-debug.log