WordPress error after flash cache

Hi Dear

The website cache plugin is wp rocket, besides that we use Radish cache, recently I have a request for flash cache in Radish cache plugin…
The WordPress site gives an error for a few minutes!

where is the problem from ?

[30-Apr-2023 09:45:21 UTC] PHP Fatal error:  Uncaught RedisException: read error on connection to 127.0.0.1:6379 in /var/www/zgc/wp-content/object-cache.php:1622
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(1622): Redis->flushDB()
#1 /var/www/zgc/wp-content/object-cache.php(149): WP_Object_Cache->flush()
#2 /var/www/zgc/wp-content/plugins/redis-cache/includes/class-plugin.php(777): wp_cache_flush()
#3 /var/www/zgc/wp-includes/class-wp-hook.php(308): Rhubarb\RedisCache\Plugin->do_admin_actions()
#4 /var/www/zgc/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#5 /var/www/zgc/wp-includes/plugin.php(517): WP_Hook->do_action()
#6 /var/www/zgc/wp-admin/admin.php(237): do_action()
#7 /var/www/zgc/wp-admin/network/admin.php(13): require_once('/var/www/zgc/wp...')
#8 /var/www/zgc/wp-admin/network/settings.php(11): require_once('/var/www/zgc/wp...')
#9 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 1622


[30-Apr-2023 09:45:22 UTC] PHP Fatal error:  Uncaught RedisException: socket error on read socket in /var/www/zgc/wp-content/object-cache.php:561
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(561): Redis->ping()
#1 /var/www/zgc/wp-content/object-cache.php(256): WP_Object_Cache->__construct()
#2 /var/www/zgc/wp-includes/load.php(750): wp_cache_init()
#3 /var/www/zgc/wp-settings.php(131): wp_start_object_cache()
#4 /var/www/zgc/wp-config.php(115): require_once('/var/www/zgc/wp...')
#5 /var/www/zgc/wp-load.php(50): require_once('/var/www/zgc/wp...')
#6 /var/www/zgc/wp-blog-header.php(13): require_once('/var/www/zgc/wp...')
#7 /var/www/zgc/index.php(17): require('/var/www/zgc/wp...')
#8 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 561


[30-Apr-2023 09:45:24 UTC] PHP Fatal error:  Uncaught RedisException: read error on connection to 127.0.0.1:6379 in /var/www/zgc/wp-content/object-cache.php:2136
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(2136): Redis->set()
#1 /var/www/zgc/wp-content/object-cache.php(294): WP_Object_Cache->set()
#2 /var/www/zgc/wp-includes/option.php(2054): wp_cache_set()
#3 /var/www/zgc/wp-includes/update.php(391): set_site_transient()
#4 /var/www/zgc/wp-includes/update.php(1020): wp_update_plugins()
#5 /var/www/zgc/wp-includes/class-wp-hook.php(308): _maybe_update_plugins()
#6 /var/www/zgc/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#7 /var/www/zgc/wp-includes/plugin.php(517): WP_Hook->do_action()
#8 /var/www/zgc/wp-admin/admin.php(175): do_action()
#9 /var/www/zgc/wp-admin/network/admin.php(13): require_once('/var/www/zgc/wp...')
#10 /var/www/zgc/wp-admin/network/plugins.php(11): require_once('/var/www/zgc/wp...')
#11 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 2136


[30-Apr-2023 09:45:26 UTC] PHP Fatal error:  Uncaught RedisException: socket error on read socket in /var/www/zgc/wp-content/object-cache.php:561
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(561): Redis->ping()
#1 /var/www/zgc/wp-content/object-cache.php(256): WP_Object_Cache->__construct()
#2 /var/www/zgc/wp-includes/load.php(750): wp_cache_init()
#3 /var/www/zgc/wp-settings.php(131): wp_start_object_cache()
#4 /var/www/zgc/wp-config.php(115): require_once('/var/www/zgc/wp...')
#5 /var/www/zgc/wp-load.php(50): require_once('/var/www/zgc/wp...')
#6 /var/www/zgc/wp-blog-header.php(13): require_once('/var/www/zgc/wp...')
#7 /var/www/zgc/index.php(17): require('/var/www/zgc/wp...')
#8 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 561


[30-Apr-2023 09:45:26 UTC] PHP Fatal error:  Uncaught RedisException: socket error on read socket in /var/www/zgc/wp-content/object-cache.php:561
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(561): Redis->ping()
#1 /var/www/zgc/wp-content/object-cache.php(256): WP_Object_Cache->__construct()
#2 /var/www/zgc/wp-includes/load.php(750): wp_cache_init()
#3 /var/www/zgc/wp-settings.php(131): wp_start_object_cache()
#4 /var/www/zgc/wp-config.php(115): require_once('/var/www/zgc/wp...')
#5 /var/www/zgc/wp-load.php(50): require_once('/var/www/zgc/wp...')
#6 /var/www/zgc/wp-blog-header.php(13): require_once('/var/www/zgc/wp...')
#7 /var/www/zgc/index.php(17): require('/var/www/zgc/wp...')
#8 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 561


[30-Apr-2023 09:45:27 UTC] PHP Fatal error:  Uncaught RedisException: socket error on read socket in /var/www/zgc/wp-content/object-cache.php:561
Stack trace:
#0 /var/www/zgc/wp-content/object-cache.php(561): Redis->ping()
#1 /var/www/zgc/wp-content/object-cache.php(256): WP_Object_Cache->__construct()
#2 /var/www/zgc/wp-includes/load.php(750): wp_cache_init()
#3 /var/www/zgc/wp-settings.php(131): wp_start_object_cache()
#4 /var/www/zgc/wp-config.php(115): require_once('/var/www/zgc/wp...')
#5 /var/www/zgc/wp-load.php(50): require_once('/var/www/zgc/wp...')
#6 /var/www/zgc/wp-blog-header.php(13): require_once('/var/www/zgc/wp...')
#7 /var/www/zgc/index.php(17): require('/var/www/zgc/wp...')
#8 {main}
  thrown in /var/www/zgc/wp-content/object-cache.php on line 561