"Single page application" Tutorial Run button not working

[Joel Di Rosa]

Hello everyone, 

I was doing the tutorials, and as i was looking the "Single page application" tutorial i found the Run button is not working, it appears as it is still loading, and i can't run my code lol.

I've already made the other tutorials just fine, but particulary on this one, i can't.

Thx in advance!

Regards,

Joel.