unknown An error code that indicates an unknown error occurred. Declarationstatic var unknown: OSSystemExtensionError.Code { get } See AlsoError CodesOSSystemExtensionError.CodemissingEntitlementunsupportedParentBundleLocationextensionNotFoundextensionMissingIdentifierduplicateExtensionIdentiferunknownExtensionCategorycodeSignatureInvalidvalidationFailedforbiddenBySystemPolicyrequestCanceledrequestSupersededauthorizationRequired