Fatal error: Uncaught Error: Interface 'Magento\Framework\Setup\Declaration\Schema\OperationInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/framework/Setup/Declaration/Schema/Operations/AddComplexElement.php:21 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/framework/Setup/Declaration/Schema/Operations/AddComplexElement.php on line 21