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Upgrading solution from v11.2 using version utility is giving an index error

HI, We are trying to upgrade our application using version utility. Currently we are using v11.2 version utility. We are using standard controls like WebDataGrid, WebHeirarchicalGrid e.t.c.

When trying to upgrade we are receiving an index error. Log shows below error. Please guide us to upgrade our application. 

10:46:15: Running User Interface Version 11.2.20112.2000
10:46:15: Gathering volume and assembly information.
10:46:27: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
10:46:27: at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at Infragistics.VersionUtilitySupport.Core.File.Types.WebSite.GetAllSiteFiles(Boolean analyze)
at Infragistics.VersionUtilitySupport.Core.File.Types.WebSite.Analyze()
at Infragistics.VersionUtilitySupport.Core.File.Types.SolutionFile.Analyze()