Type Validation: [Lcom.appiancorp.core.data.Record; cannot be cast to com.appiancorp.core.data.Record

I m getting the following error using my attached code.

Type Validation: [Lcom.appiancorp.core.data.Record; cannot be cast to com.appiancorp.core.data.Record

I have parent and child table where request id is the common column. In Report I am displaying the child data with request id as one column as link which needs to take to the parent dashboard.

Could some one help on this?

Code.txt

OriginalPostID-157866

OriginalPostID-157866