HTTP 503 on ABR requests using nginx-vod-module

Hi there!

I'm having an issue that have not managed to solve reading the forum and the github project.

I have installed a all in one RPM based installation. All is working, so I can ingest and encode content. Created a new player and I can play content using progressive download.
The issue is when I used HLS or DASH, where I get an HTTP 503 error. looking in the nginx logs, I find this:

{...} *1570 media_set_parse_json: failed to parse json -1: expected digit got 0x0 while sending to client, {...}

Any clue?

Thanks for the help!