undefined(OnNoEngineAvailable) Error in Qlik Sense Server

    We as partners of qlik, have Qlik Sense Server edition up and running for a client. The experience has been smooth until today. Usually, at certain occasions, Qlik Sense Engine fails and displays an error message saying "Connection to engine failed". This is fine because our work around for this problem is to just open Services and restart all the qliksense services. After that it works just fine.

     

    However, today we encountered a problem. We are getting an error message saying:

     

    undefined(OnNoEngineAvailable)

     

    When I got to services to try and restart the Qliksense services, I noticed that the "Qlik Sense Engine" service is missing/ deleted. In any case is there any way to solve this issue?