Redis drop-in causes server error

I’v installed the plugin and configured wp-config to:

define( 'WP_REDIS_HOST', '127.0.0.1' );
define( 'WP_REDIS_PORT', 6379 );
define( 'WP_REDIS_PREFIX', 'wp3' );
define( 'WP_REDIS_DATABASE', 0 );
define( 'WP_REDIS_PREFIX', '25105ecc*******' );

I’m able to connect to redis host with redis-cli and given password.

In the plugin I see it doesn’t detect the drop-in presence

/I updated this part and removed diagnotics log showing false positive data/

Indeed tehre is no object-cache.php in the wp-content folder obviously because it’s in the plgin folder itself (in the installation guide it wasn’t told I should have copied it myself – should I?).

Ok, if I copy /wp-content/plugins/redis-cache/includes/object-cache.php to /wp-content/ I immediately get server error:

Fatal error: Uncaught Error: Call to a member function get() on null in /www/wwwroot/wp3.hww.ru/wp-content/object-cache.php:193 Stack trace: #0 /www/wwwroot/wp3.hww.ru/wp-includes/option.php(71): wp_cache_get() #1 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(64): get_option() #2 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(100): get_locale() #3 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(918): get_user_locale() #4 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(880): _get_path_to_translation_from_lang_dir() #5 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(850): _get_path_to_translation() #6 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(948): _load_textdomain_just_in_time() #7 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(122): get_translations_for_domain() #8 /www/wwwroot/wp3.hww.ru/wp-includes/l10n.php(202): translate() #9 /www/wwwroot/wp3.hww.ru/wp-content/object-cache.php(2917): __() #10 /www/wwwroot/wp3.hww.ru/wp-content/object-cache.php(2879): WP_Object_Cache->show_error_and_die() #11 /www/wwwroot/wp3.hww.ru/wp-content/ob in /www/wwwroot/wp3.hww.ru/wp-content/object-cache.php on line 193

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