Red Hat Satellite certificate activation failed with syntax error

Issue

• Red Hat Satellite certificate activation failed with the below error :

# rhn-satellite-activate  --rhn-cert=satellite-cert.xml 
RHN_PARENT: satellite.rhn.redhat.com

ERROR: RHN Entitlement Certificate failed to validate:
Exception reported from satellite.example.com 
Time: Fri Jun  2 15:03:32 2015
Exception type <class 'xml.parsers.expat.ExpatError'>

Exception Handler Information
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/spacewalk/satellite_tools/rhn_satellite_activate.py", line 265, in activateSatellite_local
    satCerts.storeRhnCert(cert, check_generation=1, check_version=not(options.ignore_version_mismatch))
  File "/usr/lib/python2.6/site-packages/spacewalk/satellite_tools/satCerts.py", line 477, in storeRhnCert
    stored_sc.load(db_cert)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnServer/satellite_cert.py", line 131, in load
    self._load(s)
  File "/usr/lib/python2.6/site-packages/spacewalk/server/rhnServer/satellite_cert.py", line 143, in _load
    dom_element = parseString(s)
  File "/usr/lib64/python2.6/xml/dom/minidom.py", line 1928, in parseString
    return expatbuilder.parseString(string)
  File "/usr/lib64/python2.6/xml/dom/expatbuilder.py", line 940, in parseString
    return builder.parseString(string)
  File "/usr/lib64/python2.6/xml/dom/expatbuilder.py", line 223, in parseString
    parser.Parse(string, True)
ExpatError: syntax error: line 1, column 0

• Red Hat Satellite upgrade is failing at the time of Satellite certificate activation with below error :

[root@Satellite /]# ./install.pl --external-postgresql --upgrade --skip-selinux-test
..
ExpatError: syntax error: line 1, column 0