Why does anaconda throw error message "AttributeError: 'Storage' object has no attribute 'services'" during kickstart installation of Red Hat Enterprise Linux 6?

Issue

• Following traceback error messages are thrown by anaconda during kickstart installation :

CRITICAL: anaconda 13.21.82 exception report
Traceback (most recent call first):
  File "/usr/lib/anaconda/instdata.py", line 172, in write
    services = list(self.storage.services)
  File "/usr/lib/anaconda/backend.py", line 316, in writeConfiguration
    anaconda.id.write()
  File "/usr/lib/anaconda/dispatch.py", line 208, in moveStep
    rc = stepFunc(self.anaconda)
  File "/usr/lib/anaconda/dispatch.py", line 126, in gotoNext
    self.moveStep()
  File "/usr/lib/anaconda/text.py", line 657, in run
    anaconda.dispatch.gotoNext()
  File "/usr/bin/anaconda", line 1115, in <module>
    anaconda.intf.run(anaconda)
AttributeError: 'Storage' object has no attribute 'services'