Paperless ngx issue

Hi, I,m running UmbrelOS 1.7.4 on a Proxmox VM. I tried to install Paperless ngx 3.1.3 from the app store. The installation run slowly and, at the end, I tried to launch the program but an Error_Connection_Refuses opened up on the browser. After some attempts, I tried to install Papra.
Same error.
I’ve installed Paperless on a Proxmox LXC bare metal and it works.
I have othe apps on UmbrelOs that run smmothly.
Any idea?
Thankyou