Why Red Hat Satellite certificate activation failed with error "There was a problem validating the satellite certificate: 1" ?

Issue

• Red Hat Satellite activation fails with the following error:

Where is your satellite certificate file? /opt/<cert_name>.cert
** Loading RHN Satellite Certificate.
** Verifying certificate locally.
** Activating RHN Satellite.
There was a problem validating the satellite certificate: 1

• Satellite certificate activation fails with below error:

[root@system mnt]# rhn-satellite-activate --rhn-cert=/opt/<cert_name>.cert 
RHN_PARENT: satellite.rhn.redhat.com
Error reported from RHN: <Fault -211: 'Invalid channel'>
ERROR: unhandled XMLRPC fault upon remote activation: <Fault -211: 'Invalid channel'>

ERROR: <Fault -211: 'Invalid channel'>