I get the following error in the upgrade log when i try to upgrade a Visual studio project. 

12:06:19: web.config has been backed up.

12:06:19: Updating LatonClient.csproj...

12:06:19: LatonClient.csproj has been backed up.

12:06:19: No matching assembly located in available assemblies Infragistics2.Win.UltraWinCalcManager.v10.1.FormulaBuilder

12:06:19:    at Infragistics.VersionUtilitySupport.Core.ProductAssemblies.AssemblyList.AssemblyNameChange(String assemblyName, Int32 versionLocation, XmlNamespaceManager xmlNamespaceManager, String& assemblyNameNoVersion, Boolean ignoreErrors)

   at Infragistics.VersionUtilitySupport.Core.ProductAssemblies.AssemblyList.FindNewAssemblyNode(String assemblyName)

   at Infragistics.VersionUtilitySupport.Core.File.Types.ProjectFile.FetchNewAssemblyNode(String assemblyOldName)

   at Infragistics.VersionUtilitySupport.Core.File.Types.ProjectFile.Upgrade(String rootDirectory)