The policy store could not be initialized while configuring the policy store

Document ID : KB000108648
Last Modified Date : 31/07/2018
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Issue:
When installing the CA Single Sign-on Policy Server, the installation ends in error. This error is displayed below 

Custom Action: 
Status: FATAL ERROR 
Additional Notes: FATAL ERROR - The architecture of the Enhanced Session Assurance with DeviceDNA feature is updated in Policy Server 12.6. This feature requires CA Access Gateway 12.6 or later. For information about using the feature, see the Configure Enhanced Session Assurance with DeviceDNA section in the documentation. 
Command failed: "C:\Users\INS-IAM\AppData\Local\Temp\2\031883.tmp\smreg" -su ******\nReturn Value: -1\nStdout: The policy store could not be initialized. 
Failed to create the super user account.\nStderr: {3} 
Environment:
SSO 12.7 Policy Server on Windows 2012 R2 
Cause:
The hostname for the System DSN on ODBC SQL Server Wire Protocol Driver Setup was configured incorrectly as indicated below: 

Hostname\SQLInstance name 
Resolution:
The SQL Server hostname should be entered without the back slash and the SQL instance name