Magento Upgrade Error

Fatal error:  Call to a member function toHtml() on a non-object in /public_html/app/code/core/Mage/Core/Model/Layout.php on line 529

The line in page.xml that seems to cause the problem is

<block type=”core/profiler” output=”toHtml”/>

Magento now uses an updated call:

<block type=”core/profiler” output=”toHtml” name=”core_profiler”/>

This should be one of the initial changes that can get your site live and updated when upgrading to Magento

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