Fatal error: Uncaught Error: Class 'Magento\Eav\Block\Adminhtml\Attribute\Edit\Main\AbstractMain' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-configurable-product/Block/Adminhtml/Product/Attribute/Edit/Tab/Variations/Main.php:17 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-configurable-product/Block/Adminhtml/Product/Attribute/Edit/Tab/Variations/Main.php on line 17