BIP2434
Severity
20 : ErrorMessage
(<insert_0>, <insert_1>) : <insert_4> field index expression does not evaluate to INTEGER value; '<insert_2>' evaluates to <insert_3>.Explanation
A field index must be an INTEGER value. The expression '<insert_2>' evaluates to a value of type <insert_3>.Response
Ensure that only expressions evaluating to INTEGER values are used to designate field indexes with <insert_4>.