I have an Ubuntu 14.04 server, in this I have Licode linckia WebRTC is already installed and running in https on port 3004, I have installed the ssl certificate and everything is going well on the web part, I can connect with other users, enter a room and record the conversation of the person requesting it. My problem is that when I try to access the webRTC through the Licode client Android app this does not connect and I get the following error:

And on the screen of the licode app I can not see anything, only a black screen.

Could someone help me fix it?