BIP2524
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : Cannot assign a list to a non-list, nor a non-list to a list.
Explanation
A list of values cannot be assigned to a scalar variable or single message field, nor can a scalar value be assigned to a list.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow.