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There is an extra comma at the end of line 2904 in the object-cache.php file. If you remove the comma after ‘<code>wp-config.php</code>’
the site fatal error should be resolved.
This is the original code on line 2904:
$message .= '<p>' . sprintf(
__( 'This means that the connection information in your %1$s file are incorrect or that the Redis server is unreachable.' ),
'<code>wp-config.php</code>',
) . "</p>\n";
