npm install i18next-conv: Erro: Não é possível encontrar o módulo 'stream legível'

Estou tentando instalar o i18next-conv mas, quando eu corrosudo npm install i18next-conv -g, Eu recebo este erro:

Error: Cannot find module 'readable-stream'
at Function._resolveFilename (module.js:337:11)
at Function._load (module.js:279:25)
at Module.require (module.js:359:17)
at require (module.js:375:17)
at Object.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/sha/index.js:3:48)
at Module._compile (module.js:446:26)
at Object..js (module.js:464:10)
at Module.load (module.js:353:31)
at Function._load (module.js:311:12)
at Module.require (module.js:359:17)

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System Darwin 11.4.2
command "node" "/usr/local/bin/npm" "install" "i18next-conv" "-g"
cwd /Users/personalcomputer/Desktop
node -v v0.6.18
npm -v 1.3.5

Additional logging details can be found in:
    /Users/personalcomputer/Desktop/npm-debug.log
not ok code undefined
not ok code 1

Alguém pode me dizer o que posso fazer para instalá-lo?

Obrigado!

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