union install error

gistfile1.txt

% npm install union  
npm http GET https://registry.npmjs.org/union/0.3.0
npm http 200 https://registry.npmjs.org/union/0.3.0
npm http GET https://registry.npmjs.org/union/-/union-0.3.0.tgz
npm http 200 https://registry.npmjs.org/union/-/union-0.3.0.tgz
npm http GET https://registry.npmjs.org/pkginfo
npm http GET https://registry.npmjs.org/qs
npm http 304 https://registry.npmjs.org/pkginfo
npm http 200 https://registry.npmjs.org/qs
npm ERR! error installing pkginfo@0.2.3
npm ERR! error installing union@0.3.0
npm ERR! error rolling back union@0.3.0 Error: UNKNOWN, unknown error '/Users/trodrigues/code/website/node_modules/union/node_modules/___qs.npm/package'

npm ERR! Error: ENOENT, no such file or directory '/Users/trodrigues/code/website/node_modules/union/node_modules/pkginfo/package.json'
npm ERR! You may report this log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <npm-@googlegroups.com>
npm ERR! 
npm ERR! System Darwin 11.3.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "union"
npm ERR! cwd /Users/trodrigues/code/website
npm ERR! node -v v0.6.11
npm ERR! npm -v 1.1.1
npm ERR! path /Users/trodrigues/code/website/node_modules/union/node_modules/pkginfo/package.json
npm ERR! code ENOENT
npm ERR! message ENOENT, no such file or directory '/Users/trodrigues/code/website/node_modules/union/node_modules/pkginfo/package.json'
npm ERR! errno {}
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/trodrigues/code/website/npm-debug.log
npm not ok

as a personal note, updating npm and clearing it's cache fixes this problem