Fatal error 4.4.3 to 5

[ESHEila]

I was upgading from 4.4.3 to 5 and I got fatal error. Backend and frontend both not working and no access. Can I fix this or is it better to delete joomla and re-install?

PHP Fatal error: Declaration of Joomla\CMS\Log\DelegatingPsrLogger::log($level, Stringable|string $message, array $context = []): void must be compatible with PsrExt\Log\LoggerInterface::log($level, $message, array $context = []) in /home/c3k5hc79/public_html/libraries/src/Log/DelegatingPsrLogger.php on line 77

I had no problem with another website with same plugins and host. I admit that I was careless, because this is a small website.

[Per Yngve Berg]

Enable Debug in Configuration.php and get the Stack Trace. Identifisere the Plugin that is causing the trouble and disable it

[leolam]

Disable PSR extension in PHP.

Leo

[ESHEila]

Thank you! I'll try to fix the problem. It's quite difficult for me. I have been using Joomla for over 10 years on 5 sites without any serious problems.