500 Internal Server Error

Undefined variable: link (8)

#0 /var/www/products.newarel.com/public_html/views/filtro.php(60): flight\Engine->handleError()
#1 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/template/View.php(125): include('/var/www/produc...')
#2 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/template/View.php(138): flight\template\View->render()
#3 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Engine.php(481): flight\template\View->fetch()
#4 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(210): flight\Engine->_render()
#5 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(144): flight\core\Dispatcher::invokeMethod()
#6 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(49): flight\core\Dispatcher::execute()
#7 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Engine.php(92): flight\core\Dispatcher->run()
#8 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(210): flight\Engine->__call()
#9 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Flight.php(77): flight\core\Dispatcher::invokeMethod()
#10 /var/www/products.newarel.com/public_html/utils/routing.php(147): Flight::__callStatic()
#11 /var/www/products.newarel.com/public_html/utils/routing.php(112): categorie()
#12 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(171): {closure}()
#13 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(145): flight\core\Dispatcher::callFunction()
#14 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Engine.php(339): flight\core\Dispatcher::execute()
#15 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(198): flight\Engine->_start()
#16 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(144): flight\core\Dispatcher::invokeMethod()
#17 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(49): flight\core\Dispatcher::execute()
#18 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Engine.php(92): flight\core\Dispatcher->run()
#19 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/core/Dispatcher.php(198): flight\Engine->__call()
#20 /var/www/products.newarel.com/public_html/vendor/mikecao/flight/flight/Flight.php(77): flight\core\Dispatcher::invokeMethod()
#21 /var/www/products.newarel.com/public_html/index.php(7): Flight::__callStatic()
#22 {main}