I have the same error...
this is my log
INFO [07/02/2012 14:12] Downloader Window_Loaded - Version: v0.4.9.2b
INFO [07/02/2012 14:12] Downloader SetConfigScreen - Begin
DEBUG [07/02/2012 14:12] Downloader AddDebug - Start reconnecting...
DEBUG [07/02/2012 14:12] Downloader AddDebug - Start downloading Pitbull ft Marc Anthony - Rain Over Me -
www.NewJams.net.mp3DEBUG [07/02/2012 14:12] Downloader AddDebug - Reconnected!
DEBUG [07/02/2012 14:12] Downloader AddDebug - Error: System.Exception - Expected a JsonObjectContract or JsonDictionaryContract for type 'SciLorsGroovesharkAPI.Groove.Functions.GetStreamKeyFromSongIDEx+GetStreamKeyFromSongIDExResult', got 'Newtonsoft.Json.Serialization.JsonObjectContract'. (
{"header":{"session":"f5abc1dd1bb0da7f9f09fe686bbaacd2","serviceVersion":"20100903","prefetchEnabled":true},"result":{"24402951":[]}}) - "C:\Users\Andrea\Desktop\SciLor's Grooveshark.com Downloader\Downloads\Pitbull ft Marc Anthony - Rain Over Me -
www.NewJams.net.mp3" deleted!
DEBUG [07/02/2012 14:12] Downloader AddDebug - Start downloading Pitbull - Rain Over Me - Rain.mp3