Thanks for writing.
Please read this article concerning our WinForms controls and ILMerge - it is mandatory to set the ResolveTypesInCurrentAssembly property in the static constructor of the form. Otherwise, you will not be able to load the required Rad types.
If you continue experiencing issues, please open a new support ticket and send me the project which throws the exception. This will allow me to assist you further.
the Telerik team
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