let parameter : Dictionary<String,AnyObject> = ["action":"add-playlist-item","playlist_id":self.dictPlayList.objectForKey("ID")!,"kod_id":arrayOfID]
错误 [&#34; action&#34;:add-playlist-item,&#34; playlist_id&#34;:166,&#34; kod_id&#34;:&lt; _TtCs21_SwiftDeferredNSArray 0x7c615620&gt;( 21, 18 ) ]
_TtCs21_SwiftDeferredNSArray 0x7c615620这个错误意味着什么?