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magento - fix Call to a member function addData() on a non-object wizardBlock->addData

Call to a member function addData() on a non-object wizardBlock->addData

solution:
check in app\code\core\Mage\Adminhtml\Block\System\Convert\Gui\Edit
if the "Tab" folder or the "upload.php", "view.php", "wizard.php" are missing or corrupted

If all the files are there just  backup the (edit) folder and replace the files with a fresh copy downloaded from the magento website.


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