Recover WordPress site from critical error?

Enable debug in wp-config.php and read the debug_log: https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/ The problem is probably an incompatible plugin or a theme incompatible with the newest version of WordPress.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)