Fatal error: Uncaught Error: Call to undefined function is_parent_slug() in /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-content/themes/Ikeba/functions.php:27
Stack trace:
#0 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-includes/class-wp-hook.php(286): imagepassshort('\xE5\xB0\x8F\xE5\x85\x90\xE7\xA7\x91\xE3\x81\xA7\xE3\x81\xAF...')
#1 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-includes/plugin.php(203): WP_Hook->apply_filters('\xE5\xB0\x8F\xE5\x85\x90\xE7\xA7\x91\xE3\x81\xA7\xE3\x81\xAF...', Array)
#2 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-includes/post-template.php(240): apply_filters('the_content', '\xE5\xB0\x8F\xE5\x85\x90\xE7\xA7\x91\xE3\x81\xA7\xE3\x81\xAF...')
#3 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-content/themes/Ikeba/single-news-child.php(20): the_content()
#4 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-includes/template.php(690): require('/var/www/vhosts...')
#5 /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-includes/template.php(647): in /var/www/vhosts/ikeba-lc.net/testsite.ikeba-lc.net/wp-content/themes/Ikeba/functions.php on line 27