BIP2912
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : Type mismatch on RETURN
Explanation
A RETURN expression is of an unexpected type. This can occur when a statement is implicitly parsed as a RETURN statement, such as when a function is used without assigning the return value.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow.