Uncaught exception: error raising upload complete event and start new uploadCancel

While uploading the file from ajaxToolkit: AjaxFileUpload and get the below error.

Problem:- Uncaught exception: error raising upload complete event and start new uploadCancel

Solution:-
<system.web>
<httpHandlers>
  <add verb="*" path="AjaxFileUploadHandler.axd" type="AjaxControlToolkit.AjaxFileUploadHandler, AjaxControlToolkit"/> </httpHandlers>

</system.web>

<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>|
<handlers> <add name="AjaxFileUploadHandler" verb="*" path="AjaxFileUploadHandler.axd" type="AjaxControlToolkit.AjaxFileUploadHandler, AjaxControlToolkit"/> </handlers>
</system.webServer>

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