BIP2547
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : <insert_3> field name expression cannot evaluate to a CHARACTER value.
Explanation
A field name must be a CHARACTER value. The expression supplied to <insert_3> cannot evaluate to a CHARACTER value.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow.