Error 500 server apache2 php7 fpm yii2. What could be the problem?

Question

Yii

Ubuntu, apache2, mysql, php7 fpm, phpmyadmin, yii2.
The root directory is var/ www/html. It has 2 folders example and yii. In the first folder there is a self-written site layout with self-written scripts. Opens in the browser, everything works. In yii, the young framework is installed by unpacking the archive and getting the key from the github. For example, I need to view the finished model through the browser, those forms. The form is made according to the descriptions from mana. Loaded in the browser and I get a response that localhost cannot process this request yet and a 500 error.

Answer 1

Just installed?
Try typing ваш_сайт/web,
if it opens - run to reconfigure the site
UPD: Oh, I didn't specify - base or advanced?
Did composer installyou? Whether advanced did ./yii init?