and i install : ee stack install --utils
Downloading phpMemcachedAdmin [Done]
Downloading clean.php [Done]
Downloading opcache.php [Done]
Downloading Opgui [Done]
Downloading OCP.php [Done]
Downloading Webgrind [Done]
Downloading pt-query-advisor [Done]
Downloading Anemometer [Done]
Destination path '/var/www/22222/htdocs/php/webgrind/webgrind-master' already exists
and
ee clean --all
Restart : memcached [OK]
Cleaning MemCache
Cleaning NGINX FastCGI cache
Cleaning opcache
Unable to clean opcache
Cleaning Redis cache