BIP2581
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : Field reference <insert_3> does not exist and could not be created when declaring <insert_4>.
Explanation
A dynamic field reference may not point to a nonexistent target. The target field reference <insert_3> specified for the declaration of dynamic field reference <insert_4> does not exist and could not be created.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow: When declaring a dynamic field reference ensure that the specified target either exists or can be created.