Fatal error: Uncaught Error: Call to undefined method Rokanthemes\Brand\Model\ResourceModel\Brand\Collection::addAttributeToSort() in /home/gasexpre/www/vendor/magento/module-catalog/Block/Product/ProductList/Toolbar.php:196 Stack trace: #0 /home/gasexpre/www/app/code/Rokanthemes/Brand/Block/Group/View.php(208): Magento\Catalog\Block\Product\ProductList\Toolbar->setCollection(Object(Rokanthemes\Brand\Model\ResourceModel\Brand\Collection)) #1 /home/gasexpre/www/vendor/magento/framework/View/Element/AbstractBlock.php(666): Rokanthemes\Brand\Block\Group\View->_beforeToHtml() #2 /home/gasexpre/www/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\View\Element\AbstractBlock->toHtml() #3 /home/gasexpre/www/vendor/magento/framework/Interception/Interceptor.php(138): Rokanthemes\Brand\Block\Group\View\Interceptor->___callParent('toHtml', Array) #4 /home/gasexpre/www/vendor/magento/framework/Interception/Interceptor.php(153): Rokanthemes\Brand\Block\Group\View\Interceptor->Magento\Framework\Interception\ in /home/gasexpre/www/vendor/magento/module-catalog/Block/Product/ProductList/Toolbar.php on line 196