Server Error in '/' Application.

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Line 85:     {
Line 86:         string mimeType = "application/octet-stream";
Line 87:         using (MemoryStream memoryStream = awsTools.Download(S3_FILE_BUCKET, imageKey, out mimeType))
Line 88:         {
Line 89:             SendResponse(context, mimeType, memoryStream);

[WebException: The remote server returned an error: (404) Not Found.]
   System.Net.HttpWebRequest.GetResponse() +1751
   Amazon.Runtime.Internal.HttpRequest.GetResponse() +54

[HttpErrorResponseException: The remote server returned an error: (404) Not Found.]
   Amazon.Runtime.Internal.HttpRequest.GetResponse() +247
   Amazon.Runtime.Internal.HttpHandler`1.InvokeSync(IExecutionContext executionContext) +509
   Amazon.Runtime.Internal.RedirectHandler.InvokeSync(IExecutionContext executionContext) +23
   Amazon.Runtime.Internal.Unmarshaller.InvokeSync(IExecutionContext executionContext) +23
   Amazon.S3.Internal.AmazonS3ResponseHandler.InvokeSync(IExecutionContext executionContext) +23
   Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext) +36

[AmazonS3Exception: The specified key does not exist.]
   TSAWSTools.S3.HandleError(AmazonS3Exception amazonS3Exception) +12
   TSAWSTools.S3.Download(String awsBucketName, String keyName, String& mimeType) +463
   file.SendResponseS3(HttpContext context, String imageKey) in c:\Websites\sycl\root\file.ashx:87
   file.ProcessRequest(HttpContext context) in c:\Websites\sycl\root\file.ashx:56
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +542
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +93