Frustrated by Magento? Then you’ll love
If you’re trying to use the browser setup workflow in the Magento 2 beta released in December of 2014, make sure your web server is using the index.php in the root of the project and not the pub/index.php file.
It’s unclear which index.php is “the right” file to point to – the pub folder seems to be an attempt to adopt a more modern, Symfony like approach that keeps your code and your web serve-able file separate, but the root level index.php seems like an affordance for developers used to Magento’s traditional structure.