Hello Jesus,

Welcome to the community!

What is the version of the product you are trying to update to 13.1? Are you using the VersionUtility shipped with 13.1 or some previous version of the VersionUtility Tool?

If you are migrating prior to NetAdvantage11.2 version to NetAdvantage 13.1, the version utility will not be of help, as the controls set is built on completely different architecture and the code logic should be changed accordingly. In such case simple change in the referenced assemblies will not be sufficient.

Here is a longshot you could try. Please notice, according our official documentation:
“There are three editions of the utility depending on the interface used – a command line interface, an Add-in interface and a Stand-Alone application.” So I suggest you try starting the VersionUtility as a standalone application from All Programs/Infragistics/NetAdvantage13.1. Make sure Visual Studio is not running and navigate to the desired project/site to update.

Also if the product you are trying to migrate is 11.2 or later, you could change the references manually, instead of using the VersionUtility.

Reference to the official documentation:

http://help.infragistics.com/doc/ASPNET/2014.1/CLR4.0/?page=Web_Using_Version_Upgrade_Utility.html

You could also reference to the following forum thread for details:

http://es.infragistics.com/community/forums/t/89510.aspx

05:57:16: Running User Interface Version 15.2.20152.1000
05:57:16: Gathering volume and assembly information.
05:57:16: Could not locate registry entry Software\Microsoft\.NETCore\v4.5\AssemblyFoldersEx where we look for installed products.
05:59:05: ProjectFile element: *.csproj is being treated as a proj file.
05:59:05: Analyzing *.csproj...
05:59:05: Nothing for us to upgrade.
05:59:05: ProjectFile element http://localhost/* is being treated as a Website
05:59:06: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
05:59:06:    at System.ThrowHelper.ThrowArgumentOutOfRangeException()
   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()

Thanks,

Sankar Sumanth Sarode

http://help.infragistics.com/doc/ASPNET/2015.2/CLR4.0/?page=Web_Using_Version_Upgrade_Utility.html

Looking forward for your reply.