Piwigo encountered a non recoverable error

/var/www/vhosts/broval.jp/httpdocs/photo/_data/templates_c no write access

#1	mkgetdir /var/www/vhosts/broval.jp/httpdocs/photo/include/template.class.php(76)
#2	Template::Template /var/www/vhosts/broval.jp/httpdocs/photo/include/common.inc.php(166)
#3	include_once /var/www/vhosts/broval.jp/httpdocs/photo/index.php(26)