Magento Call to a member function toHtml()

magento Call to a member function toHtml() on a non-object in app/code/core/Mage/Core/Model/Layout.php on line 555


Navigate to

\app\design\frontend\default\themename\layout\page.xml


Find
<block type="core/profiler" output="toHtml"/>
Replace with
<block type="core/profiler" output="toHtml" name="core_profiler"/>


Then refresh magento cache, and enjoy!!!!!!!!!!!!