Error: Frontend not Built

[endyb66]

Script
nginx-proxy-manager

Describe the bug
Executing the following command:
sh -c "$(wget --no-cache -qO- https://raw.githubusercontent.com/ej52/proxmox-scripts/main/install.sh)" -s --app nginx-proxy-manager --cleanup
Results in:

✘ Frontend not Built

[ERROR] on line 281 with exit code 128 while executing command yarn install --silent --network-timeout=30000 > $__OUTPUT

System info:

• Proxmox Version: 8.4.14
• Debian: 12.12

Additional context
Nginx Proxy Manager v2.12.2 is currently running perfectly fine within that LXC container. I just want to upgrade to the latest version. Back then when I installed it, I used this exact command above to install. I also used it in the past for upgrading.