[NullReferenceException: Object reference not set to an instance of an object.]
BotDetect.CaptchaBase.GetCode(String instanceId, CodeGenerationPurpose purpose) +355
BotDetect.CaptchaBase.GetSound(String instanceId) +224
BotDetect.Web.CaptchaHandler.GenerateSoundData(CaptchaControl captchaControl, String instanceId) +20
BotDetect.Web.CaptchaHandler.GetSoundData(HttpContext context, CaptchaControl captchaControl, String instanceId) +212
BotDetect.Web.CaptchaHandler.GetSound(HttpContext context) +301
BotDetect.Web.CaptchaHandler.ProcessRequest(HttpContext context) +135
[CaptchaHttpException: An error occured in BotDetect internal code - Http error - Check inner expection for details.]
BotDetect.Web.CaptchaHandler.ProcessRequest(HttpContext context) +602
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165
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