BIP2581
Severity
20 : Error
Message
(<insert_0>, <insert_1>) : Field reference '<insert_2>' does not exist and could not be created when declaring '<insert_3>'.
Explanation
A dynamic field reference may not point to a nonexistent target. The target field reference '<insert_2>' specified for the declaration of dynamic field reference '<insert_3>' does not exist and could not be created.
Response
When declaring a dynamic field reference ensure that the specified target either exists or can be created.