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WebForm_InitCallback causes object expected JS error

Last Modified: 2013-11-26
I have an existing web application that uses call back methods.
Since updating to Service pack 1 of Visual Studio, creating a new Web Application and importing some of the existing functionality into the new project I am getting a:

<script type="text/javascript">

WebForm_InitCallback();// -->

At the bottom of pages that is causing and "Object Expected" error?
I have checked that the .axd extension is correctly mapped in IIS as other posts suggested.

Any suggestions on how to fix this ??
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