When I save new category, I proceed to exception page.
exception 'Magento\Framework\Exception\LocalizedException' with message 'Can't create directory /var/www/html/var/generation/Magento/Catalog/Model/Indexer/Category/Product/.' in /var/www/html/vendor/magento/framework/Code/Generator.php:103 Stack trace:
/var/www/html/vendor/magento/framework/Code/Generator/Autoloader.php(35): Magento\Framework\Code\Generator->generateClass('Magento\Catalog...')
1 [internal function]: Magento\Framework\Code\Generator\Autoloader->load('Magento\Catalog...')
2 [internal function]: spl_autoload_call('Magento\Catalog...') 3 /var/www/html/vendor/magento/framework/Code/Reader/ClassReader.php(19): ReflectionClass->__construct('Magento\Catalog...') 4 /var/www/html/vendor/magento/framework/ObjectManager/Definition/Runtime.php(44): Magento\Framework\Code\Reader\ClassReader->getConstructor('Magento\Catalog...')
5 /var/www/html/vendor/magento/framework/ObjectManager/Factory/Dynamic/Developer.php(71): Magento\Framework\ObjectManager\Definition\Runtime->getParameters('Magento\Catalog...')
6 /var/www/html/vendor/magento/framework/ObjectManager/ObjectManager.php(57): Magento\Framework\ObjectManager\Factory\Dynamic\Developer->create('Magento\Catalog...', Array) 7
/var/www/html/vendor/magento/framework/Indexer/ActionFactory.php(35): Magento\Framework\ObjectManager\ObjectManager->create('Magento\Catalog...', Array) and more...#0
What is the problem? And how can I resolve it? I use Magento ver. 2.0.0
sudo chmod -R 755 var pub
and check once