too many open files?

nick@nick-VirtualBox:~/mm/dev/browser/static/target$ browserify-graph mccg.js
/usr/local/lib/node_modules/browserify-graph/browserify-graph:62
    if (err) throw err;
             ^

Error: EMFILE: too many open files, open '/media/sf_mmfi/dev/node_modules/react/package.json'
    at Error (native)
