Getting InvalidOperationException 4009 in Blend

Question

When opening two user controls side by side in Expression Blend I get this error appearing:

An Exception was thrown.

InvalidOperationException: 4009 An error has occurred.

StackTrace

at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
at MS.Internal.XcpImports.ResourceDictionary_Add(ResourceDictionary dictionary, String key, Depen.... (can't read the rest of the line)
at System.Windows.ResourceDictionary.Add(String key, Object value)
at System. Windows.ResourceDictionary.System.Collections.Generic.IDictionary<System.Object,System... (can't read the rest of the line)

InnerException:None

If I close the controls, rebuild, then reopen one of them it appears ok. But when I open the other control i get this error again.

Any ideas....?

Answer 1

Howdy,

Do either of your controls have a dependency on each other and if so is it a binding at all?

Cheers

---

Expression MVP

Learn Expression Blend at learnexpressionstudio.com

my blog : http://x-coders.com/blogs/sneaky/default.aspx

Answer 2

Hi,

I had the same problem, and asked here 15 mins ago.

After some cleaning up in my project, I have found my issue.
It was a image resource in my App.xaml.
The image was working in the designer, but didn't show up at runtime. After deleting the resource, error 4009 disappeared.

greets.

Answer 3

I have the same error when i try

figure.Segments.Add(seg)

not once on one 'seg' element.

commoninterview.com/technical_questions/where-you-can-find-list-of-silverlight-error-codes-with-explanations/ link talk that 4009 error code means "Element is already the child of another element."

Maybe you try to include one dictionary not once.