The version for tier 'release' is not defined!

Symptoms

A cPanel install or update fails with the following error:

CONFIG_TEXT: Tried to sync version /etc/cpanel/TIERS.json file but failed: exit level [die] [pid=***] (Failed to download URL 'http://$IP/cpanelsync/TIERS.json.asc'.)

***** FATAL: The version for tier 'release' is not defined!

Cause

The issue is generated by the presence of the /etc/cpsources.conf file which contains a wrong URL or IP address.

Resolution

Move aside /etc/cpsources.conf or properly configure the file.

To move aside the file:

1. Log in to the server via SSH or WHM's Terminal as the root user

2. Run the following command:

   # mv -v /etc/cpsources.conf{,.backup.$(date +%F_%R)}

Additional Resources

Installation Guide - Customize Your Installation