Error: 'Cannot create unknown type '{clr-namespace:NameSpace.Properties}Settings'.'

Question

I define my settings and styles in a ResourceDictionary:

Answer 1

Keep your "Build Action" property to "Resource" and just change this row:

xmlns:properties="clr-namespace:Kavand.UI.Properties"

with this:

xmlns:properties="clr-namespace:Kavand.UI.Properties;assembly=Kavand.UI"

Answer 2

I had set the file's "Build Action" property to "Resource". When I changed it to "Page" the problem was resolved.

Answer 3

As a variation on other answers & comments, this worked for me:

• Set the file's "Build Action" property to "Page".

• Build (problem gone - but...:)

• Set the file's "Build Action" property to "Resource".

• Build

• Problem still gone!

Seems like a VS bug to me.

Answer 4

Just posting another potential solution, because i just recently stumbled over this exception.

It could be that your referenced class-cefinition (in your case "Kavand.UI.Properties.Settings") does not use "public"-access-modifier.

So in my case i could solve this problem by writing public before the class definition.