Mage registry key “_singleton/core/resource” already exists

Ever had the “Mage registry key “_singleton/core/resource” already exists” error in Magento and can’t get rid of it? First of all, if you search this on Google, don’t believe anything you read in the first 2-3 pages of results (pages > 3 don’t matter anyway, that’s a black hole…). Even found a champ claiming to […]