Expected Values Like original_stack Are Missing On Downgrades

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/spark_client.py", line 88, in <module>
    SparkClient().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 329, in execute
    method(env)
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 806, in restart
    self.pre_upgrade_restart(env, upgrade_type=upgrade_type)
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/spark_client.py", line 79, in pre_upgrade_restart
    import params
  File "/var/lib/ambari-agent/cache/common-services/SPARK/1.2.1/package/scripts/params.py", line 62, in <module>
    stack_version_unformatted = config['commandParams']['original_stack'].split("-")[1]
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/config_dictionary.py", line 73, in __getattr__
    raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!")
resource_management.core.exceptions.Fail: Configuration parameter 'original_stack' was not found in configurations dictionary!