The application could not run because of the following error:
#0 /nauka-spiewu/client/view/include/public_header.php(9): Slim\Slim::handleErrors(8, 'Undefined varia...', '/nauka-spiewu/c...', 9, Array)#1 /nauka-spiewu/client/view/shop-product.php(1): require_once('/nauka-spiewu/c...')#2 /nauka-spiewu/server/vendor/Slim/View.php(278): require('/nauka-spiewu/c...')#3 /nauka-spiewu/server/vendor/Slim/View.php(255): Slim\View->render('/shop-product.p...', Array)#4 /nauka-spiewu/server/vendor/Slim/View.php(243): Slim\View->fetch('/shop-product.p...', NULL)#5 /nauka-spiewu/server/vendor/Slim/Slim.php(757): Slim\View->display('/shop-product.p...')#6 /nauka-spiewu/index.php(635): Slim\Slim->render('/shop-product.p...')#7 [internal function]: {closure}()#8 /nauka-spiewu/server/vendor/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)#9 /nauka-spiewu/server/vendor/Slim/Slim.php(1338): Slim\Route->dispatch()#10 /nauka-spiewu/server/vendor/Slim/Middleware/Flash.php(85): Slim\Slim->call()#11 /nauka-spiewu/server/vendor/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()#12 /nauka-spiewu/server/vendor/Slim/Middleware/ContentTypes.php(81): Slim\Middleware\MethodOverride->call()#13 /nauka-spiewu/server/vendor/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\ContentTypes->call()#14 /nauka-spiewu/server/vendor/Slim/Slim.php(1283): Slim\Middleware\PrettyExceptions->call()#15 /nauka-spiewu/index.php(1276): Slim\Slim->run()#16 {main}