Fatal error: Uncaught Error: Class 'Magento\Framework\Data\Collection' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-indexer/Ui/DataProvider/Indexer/DataCollection.php:14 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-indexer/Ui/DataProvider/Indexer/DataCollection.php on line 14