Heimdall update issue

[HolgerM1]

Hi,
I set up the lxc using the "old" script @ https://tteck.github.io/Proxmox/. Today I tried updating with the script provided. Neither the original nor the recent script from https://community-scripts.github.io/ProxmoxVE/scripts?id=heimdall-dashboard works. With the old one I got an error message about
Error Class "DOMDocument" not found at vendor/nunomaduro/termwind/src/HtmlRenderer.php:32
The command
apt-get install php-dom
did not help.
Using the old script, I get:
[ERROR] in line 78: exit code 0: while executing command COMPOSER_ALLOW_SUPERUSER=1 composer dump-autoload &> /dev/null

Actually, my Version of Heimdall is 2.5.3

[HolgerM1]

Finally solved it by first
apt-get install php-dom
and then run the old script from tteck