NPM Install Issues Ubuntu 9.04

Question

All, Trying to install NPM using the commands from here: http://howtonode.org/introduction-to-npm

Specifically, when I run:

curl http://npmjs.org/install.sh | sh

This is the error I get...

node cli.js cache clean
TypeError: Object #<an EventEmitter> has no method 'on'
at Object.<anonymous> (/home/sanjay/npm-1285345468/lib/utils/rm-rf.js:12:9)
at Module._compile (module:385:23)
at Module._loadScriptSync (module:397:16)
at Module.loadSync (module:296:10)
at loadModule (module:241:16)
at require (module:364:12)
at Object.<anonymous> (/home/sanjay/npm-1285345468/cli.js:14:10)
at Module._compile (module:385:23)
at module:413:20
at fs:52:23
make: *** [uninstall] Error 1
sanjay@sanjay-desktop:~$ 

Not sure if I am doing something silly, any help is appreciated..Thank you!