Getting sdp null exception on Android

Hi,
I am loading using custom server with https://github.com/EricssonResearch/openwebrtc-examples/tree/master/web loaded . The app is working fine when my server IP is loaded on a browser, but on Android NativeCall app, when I replace the 'DEFAULT_SERVER_ADDRESS' variable in Config file with my IP , I am getting sdp null exception. I am using "mmt-stun.verkstad.net" for stun-server. what am I doing wrong ? Should I change anything else other that 'DEFAULT_SERVER_ADDRESS' variable.

Thanks.

Start with the NativeCall app's Config file and the DEFAULT_SERVER_ADDRESS setting, then compare its setup with the web example loaded from the linked custom server. Reproduce the Android run using the reported server IP and mmt-stun.verkstad.net, and trace where the SDP becomes null. Done means the app completes SDP setup without the reported exception.

Written by the indexing model from the issue text.