Gulp installation failing

The following error on npm install

npm ERR! code 1
npm ERR! Command failed: /usr/bin/git checkout 6d71a65
npm ERR! error: pathspec '6d71a65' did not match any file(s) known to git.
npm ERR!

npm ERR! A complete log of this run can be found in:
npm ERR!     /var/www/.npm/_logs/2018-12-18T11_47_09_588Z-debug.log