The number of errors that have occurred in processing the current text string, since the last call to objectForProperty:error: with the NSSpeechErrorsProperty property. An NSNumber
Using the NSSpeechErrorOldestCode keys and the NSSpeechErrorNewestCode keys, you can get information about the oldest and most recent errors that occurred since the last call to objectForProperty:error:, but you cannot get information about any intervening errors.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)