Fatal error: Uncaught Error: Interface 'Magento\Framework\Indexer\IndexMutexInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-indexer/Model/IndexMutex.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-indexer/Model/IndexMutex.php on line 18