Inside the brackets you want to have UBlackboardKeyType_Object. If you are trying to use a type other than Object, then you would change what is after underscore (_) to the appropriate type (such as Vector or Bool).
Inside the brackets you want to have UBlackboardKeyType_Object. If you are trying to use a type other than Object, then you would change what is after underscore (_) to the appropriate type (such as Vector or Bool).