Backend fatal error: PHP Fatal error: Declaration of Drupal\\dblog\\Logger\\DbLog::emergency(Stringable|string $message, array $context = [])

@smurfxx Not able to reproduce the issue, Can you please provide the complete log?

I only have that message on my server console, I didn't install via composer because the site is on a shared server that doesn't support it, so I installed everything manually, copying latest Google API PHP library (2.15.0) via FTP on site_root/libraries/google_api_client

The error is basically due to difference in PSR Logger version. The OP may need to update the google API module to be compatible with required PSR Logger version.