TypeError: casper.start is not a function

[Sam Ako]

I just installed "casper": "^0.1.1" and followed the basic example, but the following line:

casper.start('https://mlabs-fire-html-reports.herokuapp.com/demo/?template=ios')

throws the error: TypeError: casper.start is not a function

I'm I missing something? Saw another issue about this but it was closed without any resolution.
Thanks

[philippe....@oscaro.com]

var casper = require('casper').create();

casper.start('https://mlabs-fire-html-reports.herokuapp.com/demo/?template=ios');

casper.run();

;-)

[Sam Ako]

Sorry, forgot to add that bit of code, but I do require the module and invoke start on it.