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In a C# WPF project, I added Xceed.Wpf.AvalonDock into References. In xaml file, I have 

xmlns:xcad="http://schemas.xceed.com/wpf/xaml/avalondock"
...
<xcad:DockingManager x:Name="DockMangager" Grid.Column="0" Grid.Row="1">
</xcad:DockingManager>

Could someone help? Thank you!

user2391685
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3 Answers3

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This is a security problem of the dll when downloaded from the internet.

  • Go to the Xceed.Wpf.AvalonDock.dll file in Windows explorer
  • Open "Properties"
  • On the bottom of the dialog there is a warning under "Security"
  • Click on "Unblock"
  • Rebuild the project

You can also read this:
http://www.kodyaz.com/visual-studio/unblock-assembly-file-in-visual-studio-2012.aspx

Flat Eric
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  • in my case i added the xml namespace (i.e xmlns:ad <<-- )with Docking manager references. When I did, it solved the problem (i.e – MindRoasterMir Jan 11 '19 at 13:38
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Just had this happen to me. Mine were not blocked. My references had a yellow warning by them. I just added the Xceed DLLs again, rebuilt, and all is well.

pStan
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Add the reference to the project again and the error will go away. it is always good after adding references to clear the recent to make sure that unchecked references are not being removed.