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Message: An error occured in BotDetect internal code - Http error - Check inner expection for details.

Details: BotDetect.BaseException { BotDetect.Web.CaptchaHttpException: An error occured in BotDetect internal code - Http error - Check inner expection for details. ---> System.NullReferenceException: Object reference not set to an instance of an object. at BotDetect.CaptchaBase.GetCode(String instanceId, CodeGenerationPurpose purpose) at BotDetect.CaptchaBase.GetSound(String instanceId) at BotDetect.Web.CaptchaHandler.GenerateSoundData(CaptchaControl captchaControl, String instanceId) at BotDetect.Web.CaptchaHandler.GetSoundData(HttpContext context, CaptchaControl captchaControl, String instanceId) at BotDetect.Web.CaptchaHandler.GetSound(HttpContext ) at BotDetect.Web.CaptchaHandler.ProcessRequest(HttpContext context) --- End of inner exception stack trace --- at BotDetect.Web.CaptchaHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) }