Could you please make sure that the App_Data\RadCaptcha
directory already exists and contains all that there is an audio file for every possible character that might appear in the TextCode. If you have RadControls installed on your computer then you can get the RadCaptcha
folder from the ASP.NET Examples (C:\Program Files (x86)\Telerik\RadControls for ASP.NET AJAX <VERSION>\Live Demos\App_Data), .
I hope this helps.
All the best,
the Telerik team
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