Laravel 500 errors, when connecting a subdomain, how to fix?

Question

Laravel

Developed a project on laravel, user's personal account.

Everything worked, after the completion of the project, it is necessary to transfer the project to the lk.site.com subdomain, since site.com is just a landing page. After creating a subdomain and transferring, when accessing lk.site.com, it gives a 500 error.

I have never encountered the implementation of a subdomain on laravel, tell me how everything is arranged here for you)

P.S in ispmgr when creating a subdomain, the root one also indicated public as written in the documentation.