Can you elaborate more on the scenario in which you get the exception? Judging from the call stack, it seems that you are doing copy operation in RadPdfViewer (for WPF), which is used in a WinForms application - can you confirm?
If this is the case, we've had similar reports in the past, and it seems the underlying problem is in the Win32 API - the clipboard is locked exclusively per process and subsequent attempts to set text fails with the mentioned exception. You can read more in the following StackOverflow thread: CLIPBRD_E_CANT_OPEN error when setting the Clipboard from .NET
. More often than not, another process is blocking the clipboard for part of a second, and subsequent attempts to copy will succeed.
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