First go into your application folder and check the following files:
Drupal 8 & Drupal 9
grep VERSION core/lib/Drupal.php

Drupal 7
grep VERSION includes/bootstrap.inc

Drupal 6 and older
grep VERSION modules/system/system.module

copy-the-code
domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init
action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /var/www/html/pcx3.com/wp-includes/functions.php on line 6121