3424314 - ERS instance does not start

ERS instance does not start. Below error is shown in the traces and the traces can be found in WORK directory “/usr/sap/<SID>/Instance<Nr>/work"   

dev_enrepsrv 

[Thr 139910247598976] Replication server start with instance number <SCSID set in instance profile>
[Thr 139910247598976] *** ERROR => RepIOConnector:constr.: NiHostToAddr for '' failed with rc -2 [enrepservio. 117]
[Thr 139910247598976] *** ERROR => RepServer: main: Cannot connect to enqueue server: RepIOConnector: cannot resolve hostname [enrepserv.cp 729]

stderr0 shows below

(1794491) Starting local Command:
 Command:  er.sap<SID>_ERS<instance_number>
           pf=/usr/sap/<SID>/ERS<instance_number>/profile/<SID>_ERS<instance_number>_<hostname>
           NR=<SCSID set in instance profile>
er.sap<SID>_ERS<instance_number>=>sapparam(2): fopenU("/usr/sap/<SID>/ERS<instance_number>/profile/<SID>_ERS<instance_number>_<hostname>"  ","r"): No such file or directory
Cannot connect to enqueue server: RepIOConnector: cannot resolve hostname

SAP NetWeaver with ERS (Enqueue Replication Server) and ENSA (Standalone Enqueue Server).

Enqueue Replication Server, enserver, enrepserver, fail, ERS not working, High Availability, failover, replication, enque, doesn't,cannot start,_PF,DIR_PROFILE , KBA , BC-CST-EQ , Enqueue , Problem