Uncaught exception 'RainTpl_NotFoundException' with message 'Template blog not found!'

[mrking1280]

i'm watching a tutorials about CMS with OOP - PHP & RainTpl

i get this error

Warning: mkdir(): Permission denied in /var/www/html/cms/includes/core/raintpl.class.php on line 320

Fatal error: Uncaught exception 'RainTpl_Exception' with message 'Cache directory tmp/doesn't have write permission. Set write permission or set RAINTPL_CHECK_TEMPLATE_UPDATE to false. More details on http://www.raintpl.com/Documentation/Documentation-for-PHP-developers/Configuration/' in /var/www/html/cms/includes/core/raintpl.class.php:323 Stack trace: #0 /var/www/html/cms/includes/core/raintpl.class.php(276): RainTPL->compileFile('blog', NULL, 'templates/blog....', 'tmp/', 'tmp/blog.6a40eb...') #1 /var/www/html/cms/includes/core/raintpl.class.php(166): RainTPL->check_template('blog') #2 /var/www/html/cms/includes/controllers/ArticlesController.php(67): RainTPL->draw('blog') #3 /var/www/html/cms/articles.php(11): ArticlesController->Show() #4 {main} thrown in /var/www/html/cms/includes/core/raintpl.class.php on line 323

[Rain]

Set the write permission for the folder where you keep the template to 755 (something like chmod -R 755 templates/), also check that the file you're trying to open is there.