Unable to cast object of type 'Microsoft.Expression.Platform.WPF.InstanceBuilders.WindowInstance' to type 'System.Windows.Window' Error

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I am designing Auroglass >window.
I encountered an error.

HTML

<window x:class="GlassEffect.MainWindow" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:GlassEffect"
removed="#01FFFFFF"
src:GlassEffect.IsEnabled="true"  <----ERROR
Title="VUI Login" Height="350" Width="525">
</window>

Can anyone tell me what is going wrong?

Posted 18-Feb-12 6:02am

Sheetal Bilewar

Updated 18-Feb-12 6:34am

André Kraak

v3

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André Kraak 18-Feb-12 12:33pm

Edited question:
Added pre tags
Spelling/Grammar

Sergey Alexandrovich Kryukov 20-Feb-12 15:32pm

Not enough information. You need to show your code.
--SA

Triynko22 10-Feb-14 18:46pm

There is enough information. The "GlassEffect.IsEnabled" comes from the following project, for which the full source code is available:
http://www.codeproject.com/Articles/22sd820/Adding-Glass-Effect-to-WPF-using-Attached-Properti

When I downloaded that project and added the same attribute my WPF window, I got an identical error. The application loads fine, despite the error, and the glass effect is applied as expected. So I'm confused as to why the compiler designer is showing this error despite it compiling and running fine.

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