Exception when importing RTF file

[Felix]

Hello,

I just tried the following example of importing RTF files in the editor:
http://demos.telerik.com/aspnet-ajax/editor/examples/import-export/rtf-import-export/defaultcs.aspx

But it always shows the following exception message when I import a RTF file:
"Exception: The Document Processing Library fails to convert the input file stream to RadFlowDocument"

What is the problem?
Doesn't it support the import of all(!) RTF files?

Regards,
Felix

[Felix]

When I closed and opened the demo page again, the import worked without exception.
So for me the problem is solved for the moment.

Thanks,
Felix