What caused the error "CPasswordHelper requires the Blowfish option of the PHP crypt() function. This system does not have it"?

Question

Yii

I started to follow the tutorial on creating a blog in Yii from the office. site. Reached the authorization of the user. I registered everything that was needed, double-checked it several times, created a user record in the database, but an error appears during authorization

CPasswordHelper requires the Blowfish option of the PHP crypt() function. This system does not have it.

What is this error and what causes it?

Answer 1

www.yiiframework.com/doc/api/1.1/CPasswordHelper
First paragraph.