Been trying to get a car running through the control.html-site, but getting all kinds of errors (see attached image). Sometimes it works, sometimes it doesn't. I am running the control.html-file using a Tornado web server and visiting the site using my Mac. Maybe there is something with the encoding?

My json looks like this:
{
"name": "Driftin Cars 27 mhz",
"description": "Bought for 99 crowns at Teknikmagasinet. 27.145 mhz.",
"frequency": 27.145,
"synchronization_burst_us": 1200,
"synchronization_spacing_us": 400,
"total_synchronizations": 4,
"signal_burst_us": 400,
"signal_spacing_us": 400,

"forward": 10,
"forward_left": 27,
"forward_right": 35,
"left": 57,
"reverse": 40,
"reverse_left": 51,
"reverse_right": 45,
"right": 65

}