Comment 3 for bug 778660

I'm having the same problem. Here's my debug information:

banshee --debug
** Running Mono with --debug **
[1 Info 19:26:24.977] Running Banshee 2.0.0: [Ubuntu Natty (development branch) (linux-gnu, i686) @ 2011-04-18 16:21:33 UTC]
[1 Debug 19:26:25.131] Initializing GTK
Exception has been thrown by the target of an invocation.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Could not read add-in description
  at Mono.Addins.Addin.get_Description () [0x00000] in <filename unknown>:0
  at Mono.Addins.AddinSessionService.CheckHostAssembly (System.Reflection.Assembly asm) [0x00000] in <filename unknown>:0
  at Mono.Addins.AddinSessionService.ActivateRoots () [0x00000] in <filename unknown>:0
  at Mono.Addins.AddinSessionService.Initialize () [0x00000] in <filename unknown>:0
  at Mono.Addins.AddinManager.Initialize (System.String configDir) [0x00000] in <filename unknown>:0
  at Banshee.ServiceStack.ServiceManager.InitializeAddins () [0x00000] in /build/buildd/banshee-2.0.0/src/Core/Banshee.Services/Banshee.ServiceStack/ServiceManager.cs:71
  at Banshee.ServiceStack.ServiceManager.DefaultInitialize () [0x00005] in /build/buildd/banshee-2.0.0/src/Core/Banshee.Services/Banshee.ServiceStack/ServiceManager.cs:119
  at Banshee.ServiceStack.Application.Initialize () [0x00000] in /build/buildd/banshee-2.0.0/src/Core/Banshee.Services/Banshee.ServiceStack/Application.cs:80
  at Banshee.Gui.GtkBaseClient.Initialize (Boolean registerCommonServices) [0x00010] in /build/buildd/banshee-2.0.0/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:143
  at Banshee.Gui.GtkBaseClient..ctor (Boolean initializeDefault, System.String defaultIconName) [0x00013] in /build/buildd/banshee-2.0.0/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:95
  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
  --- End of inner exception stack trace ---
  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 /build/buildd/banshee-2.0.0/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:82
  at Hyena.Gui.CleanRoomStartup.Startup (Hyena.Gui.StartupInvocationHandler startup) [0x00044] in /build/buildd/banshee-2.0.0/src/Hyena/Hyena.Gui/Hyena.Gui/CleanRoomStartup.cs:54