ProblemDetails
data class ProblemDetails(val type: String = "about:blank", val status: Int? = null, val title: String? = null, val detail: String? = null, val instance: String? = null, val extensions: JsonObject = JsonObject(emptyMap()))(source)
Standard members of an RFC 9457 problem details object. type defaults to about:blank; problem-specific members are retained in extensions.