banshee 2 unable to start

hello,

i can not rune banshee anymore.

when start show this error message:

 An unhandled exception was thrown: Object reference not set to an instance of an object

  at Hyena.Data.Sqlite.SqliteModelCache`1[Banshee.Collection.Database.DatabaseArtistInfo].CheckCacheTable () [0x00000] in <filename unknown>:0
  at Hyena.Data.Sqlite.SqliteModelCache`1[Banshee.Collection.Database.DatabaseArtistInfo]..ctor (Hyena.Data.Sqlite.HyenaSqliteConnection connection, System.String uuid, ICacheableDatabaseModel model, Hyena.Data.Sqlite.SqliteModelProvider`1 provider) [0x00000] in <filename unknown>:0
  at Banshee.Database.BansheeModelCache`1[Banshee.Collection.Database.DatabaseArtistInfo]..ctor (Hyena.Data.Sqlite.HyenaSqliteConnection connection, System.String uuid, ICacheableDatabaseModel model, Hyena.Data.Sqlite.SqliteModelProvider`1 provider) [0x00000] in <filename unknown>:0
  at Banshee.Collection.Database.DatabaseFilterListModel`2[T,U]..ctor (System.String name, System.String label, Banshee.Sources.DatabaseSource source, Banshee.Collection.Database.DatabaseTrackListModel trackModel, Hyena.Data.Sqlite.HyenaSqliteConnection connection, Hyena.Data.Sqlite.SqliteModelProvider`1 provider, .U selectAllItem, System.String uuid) [0x00000] in <filename unknown>:0
  at Banshee.Collection.Database.DatabaseArtistListModel..ctor (Banshee.Sources.DatabaseSource source, Banshee.Collection.Database.DatabaseTrackListModel trackModel, Banshee.Database.BansheeDbConnection connection, System.String uuid) [0x00000] in <filename unknown>:0
  at Banshee.Sources.DatabaseSource+<CreateFiltersFor>c__IteratorB.MoveNext () [0x00000] in <filename unknown>:0
  at Banshee.Sources.DatabaseSource.DatabaseSourceInitialize () [0x00000] in <filename unknown>:0
  at Banshee.Sources.DatabaseSource..ctor (System.String generic_name, System.String name, System.String id, Int32 order, Banshee.Sources.Source parent) [0x00000] in <filename unknown>:0
  at Banshee.Sources.DatabaseSource..ctor (System.String generic_name, System.String name, System.String id, Int32 order) [0x00000] in <filename unknown>:0
  at Banshee.Sources.PrimarySource..ctor (System.String generic_name, System.String name, System.String id, Int32 order) [0x00000] in <filename unknown>:0
  at Banshee.Library.LibrarySource..ctor (System.String label, System.String name, Int32 order) [0x00000] in <filename unknown>:0
  at Banshee.Library.MusicLibrarySource..ctor () [0x00000] in <filename unknown>:0
  at Banshee.ServiceStack.Application.Run () [0x00000] in <filename unknown>:0
  at Banshee.Gui.GtkBaseClient.Initialize (Boolean registerCommonServices) [0x00000] in <filename unknown>:0
  at Banshee.Gui.GtkBaseClient..ctor (Boolean initializeDefault, System.String defaultIconName) [0x00000] in <filename unknown>:0
  at Banshee.Gui.GtkBaseClient..ctor () [0x00000] in <filename unknown>:0
  at Nereid.Client..ctor () [0x00000] in <filename unknown>:0
  at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (object,object[],System.Exception&)
  at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
Exception has been thrown by the target of an invocation.

  at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
  at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] in <filename unknown>:0
  at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0
  at System.Activator.CreateInstance (System.Type type) [0x00000] in <filename unknown>:0
  at Banshee.Gui.GtkBaseClient.Startup () [0x00000] in <filename unknown>:0
  at Hyena.Gui.CleanRoomStartup.Startup (Hyena.Gui.StartupInvocationHandler startup) [0x00000] in <filename unknown>:0

.NET Version: 2.0.50727.1433
OS Version: Unix 2.6.38.8

Assembly Version Information:

Banshee.AudioCd (2.0.0.0)
Banshee.MiniMode (2.0.0.0)
Banshee.CoverArt (2.0.0.0)
Banshee.Emusic (2.0.0.0)
Banshee.AmazonMp3 (2.0.0.0)
Banshee.Daap (2.0.0.0)
notify-sharp (0.4.0.0)
Banshee.SoundMenu (2.0.0.0)
Banshee.Mpris (2.0.0.0)
Migo (2.0.0.0)
Banshee.Podcasting (2.0.0.0)
Banshee.Dap (2.0.0.0)
Banshee.LibraryWatcher (2.0.0.0)
Banshee.LastfmStreaming (2.0.0.0)
Lastfm (2.0.0.0)
Banshee.MultimediaKeys (2.0.0.0)
Banshee.Bpm (2.0.0.0)
Banshee.YouTube (2.0.0.0)
Banshee.WebBrowser (2.0.0.0)
Banshee.Wikipedia (2.0.0.0)
Banshee.Lastfm (2.0.0.0)
pango-sharp (2.12.0.0)
Banshee.Fixup (2.0.0.0)
Banshee.Widgets (2.0.0.0)
gio-sharp (2.14.0.0)
gudev-sharp (1.0.0.0)
Banshee.Gio (2.0.0.0)
Banshee.GStreamer (2.0.0.0)
System.Configuration (2.0.0.0)
NDesk.DBus.GLib (1.0.0.0)
gconf-sharp (2.24.0.0)
Banshee.Gnome (2.0.0.0)
Banshee.NowPlaying (2.0.0.0)
Mono.Cairo (2.0.0.0)
System.Xml (2.0.0.0)
Banshee.Core (2.0.0.0)
Hyena.Data.Sqlite (2.0.0.0)
System.Core (3.5.0.0)
gdk-sharp (2.12.0.0)
Mono.Addins (0.4.0.0)
atk-sharp (2.12.0.0)
Hyena.Gui (2.0.0.0)
gtk-sharp (2.12.0.0)
Banshee.ThickClient (2.0.0.0)
Nereid (2.0.0.0)
NDesk.DBus.Proxies (0.0.0.0)
Mono.Posix (2.0.0.0)
Hyena (2.0.0.0)
NDesk.DBus (1.0.0.0)
glib-sharp (2.12.0.0)
System (2.0.0.0)
Banshee.Services (2.0.0.0)
Banshee (2.0.0.0)
mscorlib (2.0.0.0)

Platform Information: Linux 2.6.38-8-generic-pae i686 i386 GNU/Linux

Disribution Information:

[/etc/lsb-release]
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.04
DISTRIB_CODENAME=natty
DISTRIB_DESCRIPTION="Ubuntu 11.04"

[/etc/debian_version]
squeeze/sid

thanks for any help.