while trying to integrate zabbix with servicenow..getting below error in zabbix API while event acknowledgement

zabbix_api.ZabbixAPIException: (u'Error -32500: Application error., No permissions to referred object or it does not exist! while sending

 

Python alert script entry as below

zabbix.Event.acknowledge(

{ "eventids":[eventid], "action":6, "message":newincno}

)