PEAR error, how to fix?

Question

linux

Good afternoon! Happy holiday!
Help solve the problem:
A module has been installed on the site for a long time, and now it has stopped working, just like that!
Here are the error logs:

PHP Fatal error:  require_once(): Failed opening required 'PEAR.php' (include_path='.:/usr/share/pear:/usr/share/php') in

I tried to write in the module like this:

Сейчас: require_once 'PEAR.php';
Пробовал: require_once '/usr/share/php/PEAR.php';
require_once '/usr/share/pear/PEAR.php';

same error.
On the server:
cd /usr/share/pear/
The PEAR.php file exists!
Centos
The only thing that has been changed is the move to a new domain, but I don't think it should have an effect, because. did not change the main folder of the domain.
UPD: I put the old domain for a minute - it works, I changed it again - it doesn't work! Why?

Answer 1

1) It's either about paths or permissions
2) Forget about PEAR already, use composer