critical: Error when using local url as source

Using a HTML file url works great, so does a remote url. But when I try to use a local url through MAMP, I get this error…

Unhandled rejection Wrong status code 403 for [object Object]

Any ideas?

Using via npm and Gulp v.0.7.2

Here is my code…

var critical = require('critical');

gulp.task('critical', function(cb) {
    critical.generate({
        base: './',
        src: 'http://localurl.dev',
        css: ['css/styles.css'],
        dimensions: [{
            width: 320,
            height: 480
        }, {
            width: 768,
            height: 1024
        }, {
            width: 1280,
            height: 960
        }],
        dest: '_templates/default_site/_embeds/critical_css_home.html',
        extract: false,
        include: ['.c-slideshow, .c-more-to-see, .c-slideshow-gallery__container, .c-loader, .c-slideshow--hero'],
        exclude: ['@font-face']
    });
});

Let me know if you need more information.

Thanks!