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magento - Fatal error: Call to a member function toHtml() on a non-object in app\code\core\Mage\Adminhtml\Block\System\Convert\Gui\Edit\Tabs.php on line 69

magento - Fatal error: Call to a member function toHtml() on a non-object in app\code\core\Mage\Adminhtml\Block\System\Convert\Gui\Edit\Tabs.php on line 69

Solution
check the integrity of this file
app\code\core\Mage\Adminhtml\Block\Catalog\Product\Helper\Form\Gallery.php
and all the other files that can be missing
Download a fresh copy of your own version of magento and replace eventual missing/corrupted files.
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