Error installing Karma (Testacular)

I have version v0.8.18 from node running on my machine and I'm trying to install Karma (Testacular) but keep getting the following error. I'm having trouble understanding the error, has anyone come across this or knew what was missing?

ruby-2.0.0-p0 AngularTut marty$ npm install -g karma npm http GET https://registry.npmjs.org/karma npm http 304 https://registry.npmjs.org/karma npm ERR! Error: EACCES, mkdir '/usr/local/lib/node_modules/karma' npm ERR! { [Error: EACCES, mkdir '/usr/local/lib/node_modules/karma'] npm ERR! errno: 3, npm ERR! code: 'EACCES', npm ERR! path: '/usr/local/lib/node_modules/karma', npm ERR! fstream_type: 'Directory', npm ERR! fstream_path: '/usr/local/lib/node_modules/karma', npm ERR! fstream_class: 'DirWriter', npm ERR! fstream_stack: npm ERR! [ 'DirWriter._create (/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23)', npm ERR! '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53', npm ERR! 'Object.oncomplete (fs.js:297:15)' ] } npm ERR! npm ERR! Please try running this command again as root/Administrator. npm ERR! System Darwin 12.3.0 npm ERR! command "node" "/usr/local/bin/npm" "install" "-g" "karma" npm ERR! cwd /Users/marty/Web/AngularTut npm ERR! node -v v0.8.18 npm ERR! npm -v 1.2.2 npm ERR! path /usr/local/lib/node_modules/karma npm ERR! fstream_path /usr/local/lib/node_modules/karma npm ERR! fstream_type Directory npm ERR! fstream_class DirWriter npm ERR! code EACCES npm ERR! errno 3 npm ERR! stack Error: EACCES, mkdir '/usr/local/lib/node_modules/karma' npm ERR! fstream_stack DirWriter._create (/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23) npm ERR! fstream_stack /usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53 npm ERR! fstream_stack Object.oncomplete (fs.js:297:15) npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /Users/marty/Web/AngularTut/npm-debug.log npm ERR! not ok code 0 
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1 answer

add sudo before the command.

 sudo npm install -g karma 
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