+/** Object you invoked a method on isn't known. */
+#define DBUS_ERROR_UNKNOWN_OBJECT "org.freedesktop.DBus.Error.UnknownObject"
+/** Interface you invoked a method on isn't known by the object. */
+#define DBUS_ERROR_UNKNOWN_INTERFACE "org.freedesktop.DBus.Error.UnknownInterface"
+/** Property you tried to access isn't known by the object. */
+#define DBUS_ERROR_UNKNOWN_PROPERTY "org.freedesktop.DBus.Error.UnknownProperty"
+/** Property you tried to set is read-only. */
+#define DBUS_ERROR_PROPERTY_READ_ONLY "org.freedesktop.DBus.Error.PropertyReadOnly"