CompositionContractMismatchException on Cut, Copy, Paste

[Paul]

UPDATE: I solved this problem. It was caused by referencing a local Telerik dll in my project while at the same time having a different Telerik version installed. I'm assuming the Control was getting a mismatch between the local dll and one from the GAC.

I'm using an HtmlFormatProvider to store and retrieve text as HTML. I implemented the Cut, Copy, Paste controls by implementing a click handler on the toolbar button and calling the corresponding method on my private RadRichTextbox. When the Cut method is called it throws this exception:

Cannot cast the underlying exported value of type 'Telerik.WinControls.RichTextBox.FileFormats.Html.HtmlFormatProvider (ContractName="Telerik.WinControls.RichTextBox.FormatProviders.IDocumentFormatProvider")' to type 'Telerik.WinControls.RichTextBox.FormatProviders.IDocumentFormatProvider'.

Any suggestion would be much appreciated.

[Svett]

Hello Paul,

I am glad to determine that you have solved the issue on your own.  Do not hesitate to contact us, if you have any other questions.

All the best,
Svett
the Telerik team