Fatal error: Uncaught TypeError: flock(): supplied resource is not a valid stream resource in /var/www/html/wp-content/plugins/w3-total-cache/Cache_File.php:123
Stack trace:
#0 /var/www/html/wp-content/plugins/w3-total-cache/Cache_File.php(123): flock(Resource id #5, 3)
#1 /var/www/html/wp-content/plugins/w3-total-cache/ObjectCache_WpObjectCache_Regular.php(312): W3TC\Cache_File->set('0site-options1:...', Array, 180)
#2 /var/www/html/wp-content/plugins/w3-total-cache/ObjectCache_WpObjectCache.php(68): W3TC\ObjectCache_WpObjectCache_Regular->set('1:notoptions', Array, 'site-options', 0)
#3 /var/www/html/wp-content/object-cache.php(86): W3TC\ObjectCache_WpObjectCache->set('1:notoptions', Array, 'site-options', 0)
#4 /var/www/html/wp-includes/option.php(1845): wp_cache_set('1:notoptions', Array, 'site-options')
#5 /var/www/html/wp-includes/option.php(1681): get_network_option(1, 'siteurl', false)
#6 /var/www/html/wp-includes/default-constants.php(248): get_site_option('siteurl')
#7 /var/www/html/wp-settings.php(489): wp_cookie_constants()
#8 /var/www/html/wp-config.php(136): require_once('/var/www/html/w...')
#9 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#10 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#11 /var/www/html/index.php(17): require('/var/www/html/w...')
#12 {main}
  thrown in /var/www/html/wp-content/plugins/w3-total-cache/Cache_File.php on line 123