Instance PropertyFoundationEssentials
underlying
iOS 8.0+
iPadOS 8.0+
Mac Catalyst 8.0+
macOS 10.10+
tvOS 9.0+
watchOS 2.0+
The underlying error behind this error, if any.
var underlying: (any Error)? { get }Instance PropertyFoundationEssentials
var underlying: (any Error)? { get }