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I had a Umbraco 4 Site that I use to debug on a Windows 8 machine, and it worked well... Now I recieved a new Windows 10 machine (ASP.NET 4.6), and Umbraco BackOffice does not opening, not Front Office does.
The error I get is : Object reference not set to an object
[NullReferenceException: La référence d'objet n'est pas définie à une instance d'un objet.]
umbraco.cms.presentation.login.OnPreRender(EventArgs e) +340
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4775
I wonder if Umbraco v4 is compatible with Windows 10 (with .NET 3.5 installed)
I don't think Umbraco 4 is able to run on Windows 10 - I spoke with a former colleague of mine yesterday that mentioned that they needed to have virtual machine setup running Windows 8 in order to be able to service those clients running on very old Umbraco 4 installations.
So you probably need to do the same I guess.
Hope this helps.
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