System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidCastException: Cannot cast from source type to destination type.
  at MonoDevelop.Ide.Gui.DisplayBindingService+<GetFileViewers>c__Iterator16.MoveNext () [0x000d7] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/DisplayBindingService.cs:88
  at System.Collections.Generic.List`1[MonoDevelop.Ide.Gui.FileViewer].AddEnumerable (IEnumerable`1 enumerable) [0x0001a] in /home/tomek/projekty/not_my_projects/mono/mcs/class/corlib/System.Collections.Generic/List.cs:126
  at System.Collections.Generic.List`1[MonoDevelop.Ide.Gui.FileViewer]..ctor (IEnumerable`1 collection) [0x0002f] in /home/tomek/projekty/not_my_projects/mono/mcs/class/corlib/System.Collections.Generic/List.cs:63
  at System.Linq.Enumerable.ToList[FileViewer] (IEnumerable`1 source) [0x00006] in /home/tomek/projekty/not_my_projects/mono/mcs/class/System.Core/System.Linq/Enumerable.cs:2847
  at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectFileNodeCommandHandler.PopulateOpenWithViewers (MonoDevelop.Components.Commands.CommandArrayInfo info, MonoDevelop.Projects.Project project, System.String filePath) [0x00000] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Pads.ProjectPad/ProjectFileNodeBuilder.cs:301
  at MonoDevelop.Ide.Gui.Pads.ProjectPad.ProjectFileNodeCommandHandler.OnOpenWithUpdate (MonoDevelop.Components.Commands.CommandArrayInfo info) [0x00011] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Pads.ProjectPad/ProjectFileNodeBuilder.cs:296
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x000d5] in /home/tomek/projekty/not_my_projects/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:226
  --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x000eb] in /home/tomek/projekty/not_my_projects/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:234
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /home/tomek/projekty/not_my_projects/mono/mcs/class/corlib/System.Reflection/MethodBase.cs:96
  at MonoDevelop.Components.Commands.DefaultCommandHandler.CommandUpdate (System.Object target, MonoDevelop.Components.Commands.CommandArrayInfo info) [0x00018] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandManager.cs:1488
  at MonoDevelop.Components.Commands.CustomCommandUpdaterAttribute.CommandUpdate (System.Object target, MonoDevelop.Components.Commands.CommandArrayInfo cinfo) [0x00000] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CustomCommandUpdaterAttribute.cs:75
  at MonoDevelop.Ide.Gui.Components.MultiSelectionNodeHandlerAttribute.CommandUpdate (System.Object target, MonoDevelop.Components.Commands.CommandArrayInfo cinfo) [0x00007] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Components/NodeCommandHandler.cs:292
  at MonoDevelop.Components.Commands.CustomCommandUpdaterAttribute.MonoDevelop.Components.Commands.ICommandArrayUpdateHandler.CommandUpdate (System.Object target, MonoDevelop.Components.Commands.CommandArrayInfo cinfo) [0x00000] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CustomCommandUpdaterAttribute.cs:56
  at MonoDevelop.Components.Commands.CommandUpdaterInfo.Run (System.Object cmdTarget, MonoDevelop.Components.Commands.CommandArrayInfo info) [0x00017] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandManager.cs:1462
  at MonoDevelop.Components.Commands.CommandManager.GetCommandInfo (System.Object commandId, MonoDevelop.Components.Commands.CommandTargetRoute targetRoute) [0x0007e] in /home/tomek/projekty/not_my_projects/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandManager.cs:701