BIP2497
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : Illegal data type for target. A list field reference is required.
Explanation
The expression supplying the target must evaluate to a value of a suitable type. The given expression cannot possibly do so.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow.