can't get mixpanel with angulartics to work

Question

I'm testing out the example angulartics code for mixpanel on my mixpanel account and all requests to the mixpanel track api are cancelled and show in red in Chrome network tab.

My test: http://chovy.us.to/angulartics/samples/mixpanel.html#/c

github: http://luisfarzati.github.io/angulartics/

Example: https://github.com/luisfarzati/angulartics/blob/master/samples/mixpanel.html