You need to have at least 4.8 Microsoft .Net framework.
https://www.google.com/search?q=how+to+ ... +framework
https://dotnet.microsoft.com/en-us/down ... -framework
https://dotnet.microsoft.com/en-us/down ... work/net48
OR, if you make sure your machine is uptodate with all windows update and it should resolve the issue
Regards,
Martin
System.Linq.Enumerable.ToHashSet(System.Collections.Generic.IEnumerable`1<!!0>)
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