audino: host not found in upstream "backend"

Hi, I try to use Audino, followed by the instructions. I use: Windows 10, Git and Docker after running the commands from cmd I got this message:

nginx_1     | 2020/06/15 08:50:56 [emerg] 1#1: host not found in upstream "backend" in /etc/nginx/nginx.conf:52
nginx_1     | nginx: [emerg] host not found in upstream "backend" in /etc/nginx/nginx.conf:52
audino_nginx_1 exited with code 1

This is my docker status:

What I’m doing wrong? Thank you for your help