WebRTC connection negotiated issue in Pixel Streaming

i have edit config.json “PublicIp” to my server pulic IP ,and then run Start_WithTURN_SignallingServer.sh , open the pixel page in chrome get " WebRTC connection negotiated issue in Pixel Streaming"

In the “chrome://webrtc-internals/” , “ICE candidate grid .” is blank with no content

I have solved it。in linux ,need install coturn manually。then rerun the .sh file, it work fine。