I faced this problem twice. The first time i deleted it and restart everything, and i did from scratch. But do not worry. the second time i manage to solve the problem. If you go to your FTP application. You will realise you cannot access to wp-content because the permission is set to 000. So you have to go to your website control panel.
Change the permission to 755. Now check your website whether it is working.
You will see that it is using the default template
now change to your desire theme, and activate all the plugins again and your site should be fine.
