2519913 - Error: "Could not find the property key 'agent_host_x'. Please check whether it is mandatory" when running the ACTool - Solution Manager 7.1/7.2

Error: "Could not find the property key 'agent_host_x'. Please check whether it is mandatory" when running the ACTool

In the log the following can be seen:
2017/07/08 21:09:53.194000|==| | |  896|   1| |||||||||||||||------ Step '4. DS - Enable NCS' Start at 2017-08-08 21:09:53.194 ------
2017/07/08 21:09:53.210000|==| | |  896|   1| |||||||||||||||Load file C:\ProgramData\SAP BusinessObjects\Data Services\conf\DSConfig.txt successfully! 
2017/07/08 21:09:53.210000|==| | |  896|   1| |||||||||||||||Could not find the property key 'agent_host_2'. Please check whether it is mandatory.
2017/07/08 21:09:53.210000|==| | |  896|   1| |||||||||||||||Could not find the property key 'agent_port_2'. Please check whether it is mandatory.
2017/07/08 21:09:53.210000|==| | |  896|   1| |||||||||||||||Could not find the property key 'agent_host_3'. Please check whether it is mandatory.
2017/07/08 21:09:53.210000|==| | |  896|   1| |||||||||||||||Could not find the property key 'agent_port_3'. Please check whether it is mandatory.
2017/07/08 21:09:53.225000|==| | |  896|   1| |||||||||||||||------ Step '4. DS - Enable NCS' End at 2017-08-08 21:09:53.225 ------

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• BODS 4.x
• Solution Manager 7.1
• Solution Manager 7.2

KBA , SV-SMG-INS-DIA , Configuration of Root Cause Analysis related infrastructure , Problem