npm install fails

[ekkis]

should work, right?

$ mkdir grunt-casper-test
$ cd grunt-casper-test
$ npm init

This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See npm help json for definitive documentation on these fields
and exactly what they do.

Use npm install <pkg> --save afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
name: (grunt-casper-test)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to /Users/ekkis/Downloads/grunt-casper-test/package.json:
{
"name": "grunt-casper-test",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "",
"license": "ISC"
}
Is this ok? (yes)

$ npm install grunt-casper

npm ERR! Darwin 15.2.0
npm ERR! argv "/usr/local/Cellar/node/5.0.0/bin/node" "/usr/local/bin/npm" "install" "grunt-casper"
npm ERR! node v5.0.0
npm ERR! npm v3.5.2
npm ERR! code EREADFILE

npm ERR! Error extracting /Users/ekkis/.npm/slimerjs/0.9.5/package.tgz archive: ENOENT: no such file > or directory, open '/Users/ekkis/.npm/slimerjs/0.9.5/package.tgz'
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/ekkis/Downloads/grunt-casper-test/npm-debug.log