You can see the exception in xscontroller.out log file:
[2017-11-22 08:56:42:699] - [Controller.Balancer] - [error] - [ controller] — [baIancing - 29]: Failed to adapt number of application instances.
FAILED to run as user 'xxx' associated with current space:
No permission (sudo exit code: 1) .
SAP HANA Extended Application Services
FAIL, process,, HDB, XS, Controller, not, running, XSA, sudo, user, switch, switching, Controller, balancer, StartAppIicationException, FAILED, run, user, associated, space, No permission, exit code: 1, RestResponseException , KBA , BC-XS-RT , OP Runtime / XS Controller , Problem
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