Transfer and configure an ancient site to Symfony

Good afternoon, dear ones!

Transfer the old site to symfony (version 1.2.9). The files and the database were transferred, the config was corrected, but the site does not start. Is there anyone with experience with symfony to understand what is going on?

Requests to apply to those who have experience, settings with Symfony, with ancient versions. A modern young sysadmin (addressed) without symphonic experience with such a task could not cope.