Thank you NogDog. please will you tell me how modify the php.ini file?

Regards

HI, I had been update a Joomla site but I can't access it anymore, please will you help me? I did the next procedure:

1) I updated PHP 7.1.28 TO php 7.3.27
2) I updated Joomla from the Joomla Control Panel
3) I couln't access the Joomla site because it sent me the next error messages:

Warning: preg_split(): Allocation of JIT memory failed, PCRE JIT will be disabled. This is likely caused by security restrictions. Either grant PHP permission to allocate executable memory, or set pcre.jit=0 in /var/www/html/mi_sitio/libraries/loader.php on line 691

Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /var/www/html/mi_sitio/libraries/joomla/session/handler/joomla.php on line 46

Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /var/www/html/elect_potencia/libraries/joomla/session/handler/joomla.php on line 49

Warning: session_set_cookie_params(): Cannot change session cookie parameters when headers already sent in /var/www/html/mi_sitio/libraries/joomla/session/handler/joomla.php on line 138

Warning: session_set_save_handler(): Cannot change save handler when headers already sent in /var/www/html/mi_sitio/libraries/joomla/session/storage.php on line 101

Warning: session_name(): Cannot change session name when headers already sent in /var/www/html/mi_sitio/libraries/joomla/session/handler/native.php on line 128

Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /var/www/html/mi_sitio/libraries/joomla/session/session.php on line 928

Warning: session_cache_limiter(): Cannot change cache limiter when headers already sent in /var/www/html/mi_sitio/libraries/joomla/session/handler/native.php on line 235
Error displaying the error page: Application Instantiation Error: Failed to start the session because headers have already been sent by "/var/www/html/mi_sitio/libraries/loader.php" at line 691.

Please. I don't know whats is happen, will you help me?

Thanks a lot.
Regards.