[MonoTouch] Monotouch project converting problem

[dixit.pavans]

Hello,

I am converting my mono touch 2.6 project to mono touch 2.8.Its converting
properly but InterfaceBuilder is not opening when i am clicking on .xib file
and i am getting this error:


System.ArgumentNullException: Argument cannot be null.
Parameter name: type
  at
MonoDevelop.Projects.Dom.Parser.ProjectDom+<GetInheritanceTree>c__Iterator33.MoveNext
() [0x0023d] in
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Dom.Parser/ProjectDom.cs:164 
  at MonoDevelop.MacDev.ObjCIntegration.NSObjectProjectInfo.ResolveCliToObjc
(MonoDevelop.MacDev.ObjCIntegration.NSObjectTypeInfo type) [0x000fb] in
/private/tmp/source/monodevelop/main/src/addins/MonoDevelop.MacDev/ObjCIntegration/NSObjectProjectInfo.cs:182 
  at MonoDevelop.MacDev.ObjCIntegration.NSObjectProjectInfo.Update ()
[0x000fe] in
/private/tmp/source/monodevelop/main/src/addins/MonoDevelop.MacDev/ObjCIntegration/NSObjectProjectInfo.cs:89 
  at MonoDevelop.MacDev.ObjCIntegration.NSObjectProjectInfo.Update (Boolean
force) [0x0000c] in
/private/tmp/source/monodevelop/main/src/addins/MonoDevelop.MacDev/ObjCIntegration/NSObjectProjectInfo.cs:66 
  at MonoDevelop.MacDev.XcodeSyncing.XcodeProjectTracker.UpdateTypes
(IProgressMonitor monitor, Boolean force) [0x00034] in
/private/tmp/source/monodevelop/main/src/addins/MonoDevelop.MacDev/XcodeSyncing/XcodeProjectTracker.cs:307

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