implementing passport authentication in node.js with bitly strategy

I'm trying to authenticate to bitly so I can use the link-shortener and track the users' metrics. My implementation is like this:

passport.use(new BitlyStrategy({
    clientID: "my client id here",
    clientSecret: "my secret here",
    callbackURL: "http://website.com/auth/bitly/callback"
},
function (token, tokenSecret, profile, done) {
// Code to put it in the server here.
}
));

And the routes look like this:

app.get('/auth/bitly',
    passport.authenticate('bitly'));

app.get('/auth/bitly/callback',
passport.authenticate('bitly', { failureRedirect: '/', failureFlash: true, failureFlash: 'Invalid bitly Authentication try again.' }),
function(req, res) {
    // Successful authentication, redirect home.
    res.redirect('/');
});

Now I've done everything I can think of to get this working, but I always come up with this stupid error:

Application has thrown an uncaught exception and is terminated:
TypeError: Parameter 'url' must be a string, not undefined
at Object.urlParse [as parse] (url.js:92:11)
at [object Object]._request (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\node_modules\oauth\lib\oauth2.js:56:22)
at [object Object].get (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\node_modules\oauth\lib\oauth2.js:196:8)
at Strategy.userProfile (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\lib\passport-bitly\strategy.js:76:16)
at loadIt (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\lib\passport-oauth\strategies\oauth2.js:221:17)
at Strategy._loadUserProfile (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\lib\passport-oauth\strategies\oauth2.js:236:25)
at C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\lib\passport-oauth\strategies\oauth2.js:127:14
at C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\node_modules\oauth\lib\oauth2.js:178:7
at passBackControl (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\node_modules\oauth\lib\oauth2.js:107:9)
at IncomingMessage.<anonymous> (C:\DWASFiles\Sites\twitter-mongo\VirtualDirectory0\site\wwwroot\node_modules\passport-bitly\node_modules\passport-oauth\node_modules\oauth\lib\oauth2.js:124:7

Anyone have any idea what that means, and where I should start to get it fixed?