'Failed to retrieve directory services provider from registry' Error

Document ID : KB000108946
Last Modified Date : 01/08/2018
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Issue:
We recently started seeing this error in the Policy Server's smps.log.  We are not sure why this started appearing.  The error doesn't seem to be affecting any users, but we would like to understand it and eliminate it if possible..

[17006/139754737755904][Tue Jul 24 2018 21:22:22][SmDsObj.cpp:79][ERROR][sm-Directory-00480] Exception in SmDsObj: Failed to retrieve directory services provider from registry 
Environment:
All Supported Policy Server releases, all platforms.
Cause:
The Active Directory user store configuration did not have a namespace specified.  This was likely due to SDK use or direct editing of the policy store as the Admin UI will not allow a user store to be saved in this state.
Resolution:
Specify a namespace for the user store and save the change. 
Additional Information:
As this was an Active Directory user store and a Policy Server running on a Unix platform, only the LDAP namespace is supported.  The AD namespace is only supported on Windows based Policy Servers.