Problem with JWplayer API

Hi, I’m using WP 4.6.1 and PHP 5.6.

I install without a problem CVG and get register myself for a free key with jwplayer.com

Got my keys:

API Key: ********
API Secret: ************************

Go back to Video Player Setting and copy API Key in the box tagged JWPlayer License Key and save.

I believed that these are the steps for getting the player working but I can’t, I got the next message: Error setting up player: Invalid license key

URL: https://karlos.tarajano.com/videos/

Thanks in advance!