• Creating Error Objects

• Getting Error Properties

• Getting a Localized Error Description

• Getting the Error Recovery Attempter

• errorWithDomain:code:userInfo:

• code

• domain

• initWithDomain:code:userInfo:

• localizedDescription

• localizedFailureReason

• localizedRecoveryOptions

• localizedRecoverySuggestion

• recoveryAttempter

• userInfo

• User info dictionary keys

• Error Domains