Update your UWP project's target version for Universal Windows to the latest version. This can be done in the project's property dialog. Then reload and see if the problem goes away.
After update Visual Studio, UWP does not work
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Anderson Rodrigues Cavalcante
316
Reputation points
Hello, everyone.
I updated my VS to the latest version, then my UWP application stopped working, and the following error occurred:
XamlCompiler warning WMC0151: Member 'CheckBoxBorderBrush' on type 'Windows.UI.Xaml.Controls.Primitives.IListViewItemPresenter4' is defined under contract 'Windows.Foundation.UniversalApiContract' version '13.0.0.0', but the contract version for the targeted min version is '8.0.0.0'!
XamlCompiler error WMC0901: A type with a full name of 'Windows.UI.Xaml.DependencyObject' already exists in an included reference.
My VS version:
Developer technologies | XAML
1 answer
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 32%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMT%3C/text%3E%3C/svg%3E)
Michael Taylor 60,756 Reputation points2025-05-28T19:05:09.0166667+00:00 -
Anderson Rodrigues Cavalcante 316 Reputation points
2025-05-28T20:15:17.87+00:00 Thank you for your answer mr Taylor. It did not work.
I tryed that after publish the question but other error happened:
'An assembly with the same simple name 'Windows.Security.Isolation.IsolatedWindowsEnvironmentContract' has already been imported. Try removing one of the references (e.g. 'C:\Users\user.nuget\packages\microsoft.windows.sdk.contracts\10.0.22621.3233\ref\netstandard2.0\Windows.Security.Isolation.Isolatedwindowsenvironmentcontract.winmd') or sign them to enable side-by-side.' -
Michael Taylor 60,756 Reputation points
2025-05-28T20:27:23.9933333+00:00 Did you clean the solution and rebuild to ensure there were no cached packages being used?
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Anderson Rodrigues Cavalcante 316 Reputation points
2025-05-29T11:38:41.3+00:00 Yes. I cleaned the Solution, rebooted PC and rebuilt solution. Same error.
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Michael Taylor 60,756 Reputation points
2025-05-29T13:46:06.0933333+00:00 Sounds like you might have conflicting NuGet packages. One of them seems to be coming from the SDK reference. Not sure about the other one though. Can you share your project file?
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Anderson Rodrigues Cavalcante 316 Reputation points
2025-05-29T19:58:08.39+00:00 Mr. Taylor, Unfortunately I can't share my file, but I'll try to share the new errors. Thank you.
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Michael Taylor 60,756 Reputation points
2025-05-29T21:17:09.7833333+00:00 Can you share the project file after you strip out the
ItemGroupcontaining the files and any other sensitive data? What we are looking for is the list of NuGet packages that you rely on along with any project-level properties that may conflict. None of that is sensitive, in general.Without an idea of how your project is configured I'm afraid I'm not going to be much more useful as there is no way to replicate your issue. Perhaps somebody else can take the error messages you're getting and figure out what is going on with your project.
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Anderson Rodrigues Cavalcante 316 Reputation points
2025-08-01T17:28:04.7133333+00:00 Hi mr. Taylor. Sorry for my late. I had to update my Windows SDK Contracts nuget to version equal my target framework of the project. Thanks.
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