Debian 10 - ISPConfig 3.1.15p2 - PHP 7.4 & 5.6 - PostgreSQL 11 - MySQL - Error 404

Hello, i'm having problems with this configuration. I have a php5.6 page in a debian 8 server and want to migrate it to this debian server with php 7.4 and 5.6, the thing is that when I try to run it show me

"404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."
The requested URL was not found on this server.

I think that the problem is in "Configuration - apache2handler"
Hostnameort sice.senadosalta.gob.ar:0
The server Hostnameort is 127.0.0.1:80
And don't know how to change it

I add a google drive folder with both phpinfo (old server working and the new server not working)

 

Link in google drive sortened
shorturl . at / stvLV

 

Looks like you have multiple problems.
1. There is an error, but the error cannot be shown, because
2. The error documents are not found

Have you set the website to use own error documents? Does the corresponding folder exist? Look in Apaches' error.log file for better explanation.