BIP2448
Severity
20 : Error
Message
(<insert_1>, <insert_2>) : Illegal operand for NOT operator applied to value <insert_3>.
Explanation
The operand for the NOT operator must be a boolean expression. An attempt was made to apply the NOT operator to an inappropriate value.
Response
Correct the syntax of your ESQL expression in node <insert_1>, around line and column <insert_2>, then redeploy the message flow: Ensure that the NOT operator is only applied to boolean expressions.