Error evaluating loop expression in workflow - Undefined variables: records

[p_devulapalli]

I am trying to create a workflow using a loop task which has a input from a DQL query. The loop task is referenced inside a HTTP request task . I keep getting the below error, looking for advice on what is that I am missing here please

Loop task 

Error

Unhandled failed task(s) during workflow execution:

monitoringmode_update:
Error evaluating loop expression. Undefined variables: records.