ngCordova error when trying to update with bower

I've tried to make sure I'm using the latest version as my ngCordova media plugin isn't working for some reason.

I get this error:

    npm WARN locking Error: EACCES, open '/Users/SubjectiveEffect/.npm/_locks/bower-e8debc5417026b57.lock'
npm WARN locking     at Error (native)
npm WARN locking  /Users/SubjectiveEffect/.npm/_locks/bower-e8debc5417026b57.lock failed { [Error: EACCES, open '/Users/SubjectiveEffect/.npm/_locks/bower-e8debc5417026b57.lock']
npm WARN locking   errno: -13,
npm WARN locking   code: 'EACCES',
npm WARN locking   path: '/Users/SubjectiveEffect/.npm/_locks/bower-e8debc5417026b57.lock' }
npm ERR! Darwin 14.5.0
npm ERR! argv "node" "/usr/local/bin/npm" "install" "-g" "bower"
npm ERR! node v0.12.7
npm ERR! npm  v2.11.3

npm ERR! Attempt to unlock /usr/local/lib/node_modules/bower, which hasn't been locked
npm ERR! 
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/SubjectiveEffect/myApp/npm-debug.log

I've no idea how to fix this.

Anyone any ideas?