Unable to get property 'PageRequestManager' of undefined or null reference

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ASP.NET

Ajax

Hi,
I am getting the below error in IE-10 browser and works fine in other browsers.

"Unable to get property 'PageRequestManager' of undefined or null reference"

<script type="text/javascript" language="javascript">
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequestHandle);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandle);
function beginRequestHandle(sender, Args) {
//some code here
}

function endRequestHandle(sender, Args) {
// some code here
}
</script>

Please provide the nature of the issue and solution .?