[NSKeyedUnarchiver init]: cannot use -init for initialization' error when trying to save a custom class - swift

Question

I get the error:
[NSKeyedUnarchiver init]: cannot use -init for initialization
when trying to load a custom class.
Heres my Init for the class:
required init?(coder aDecoder: NSCoder) {
print("intializing")
if let quoteName = aDecoder.decodeObjectForKey("quoteName") as? String {
self._quoteName = quoteName
}
if let quote = aDecoder.decodeObjectForKey("quote") as? String {
self._quote = quote
}
if let soundFileName = aDecoder.decodeObjectForKey("soundFileName") as? String {
self._soundFileName = soundFileName
}
if let soundFileType = aDecoder.decodeObjectForKey("soundFileType") as? String {
self._soundFileType = soundFileType
}
if let audioFilePath = aDecoder.decodeObjectForKey("audioFilePath") as? String {
self._soundFileType = audioFilePath
}
if let state = aDecoder.decodeObjectForKey("state") as? Bool {
self._state = state
}
if let number = aDecoder.decodeObjectForKey("number") as? Int {
self._number = number
}
}
Heres my Encoder function
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(self._quoteName, forKey: "quoteName")
aCoder.encodeObject(self._quote, forKey: "quote")
aCoder.encodeObject(self._soundFileType, forKey: "soundFileName")
aCoder.encodeObject(self._soundFileType, forKey: "soundFileType")
aCoder.encodeObject(self._audioFilePath, forKey: "audioFilePath")
aCoder.encodeObject(self._state, forKey: "state")
aCoder.encodeObject(self._number, forKey: "number")
}
Any finally my call to load:
class func loadQuoteList(){
print("loading Quotes")
quoteList.removeAll()
var quoteListLength = defaults.integerForKey("quoteListLength")
//unarchives Quote Object
var unarc = NSKeyedUnarchiver()
if let data = defaults.objectForKey("Quote") as? NSData {
unarc = NSKeyedUnarchiver(forReadingWithData: data)
}
print("loading individual quotes")
for(var index = 0; index < quoteListLength; index++){
var newQuote = unarc.decodeObjectForKey("Quote\(index)") as! Quote
quoteList[index] = newQuote
print(newQuote._quoteName)
}
}