Fatal error: Uncaught Error: Class 'Snsdev\Hreflangcode\Observer\AddHreflangTags' not found in /home/adminmaster/public_html/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php:121 Stack trace: #0 /home/adminmaster/public_html/vendor/magento/framework/ObjectManager/Factory/Compiled.php(108): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Snsdev\\Hreflang...', Array) #1 /home/adminmaster/public_html/vendor/magento/framework/ObjectManager/ObjectManager.php(70): Magento\Framework\ObjectManager\Factory\Compiled->create('Snsdev\\Hreflang...') #2 /home/adminmaster/public_html/vendor/magento/framework/Event/ObserverFactory.php(33): Magento\Framework\ObjectManager\ObjectManager->get('Snsdev\\Hreflang...') #3 /home/adminmaster/public_html/vendor/magento/framework/Event/Invoker/InvokerDefault.php(72): Magento\Framework\Event\ObserverFactory->get('Snsdev\\Hreflang...') #4 /home/adminmaster/public_html/vendor/magento/framework/Event/Manager.php(66): Magento\Framework\Event\Invoker\InvokerDefault in /home/adminmaster/public_html/vendor/magento/framework/ObjectManager/Factory/AbstractFactory.php on line 121