Fatal error: Uncaught Error: Call to undefined function get_field() in /customers/d/d/0/danieleguidugli.com/httpd.www/wp-content/themes/kalium/includes/classes/compatibility/kalium-acf.php:62
Stack trace:
#0 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-content/themes/kalium/includes/functions/core-hook-functions.php(627): Kalium_ACF->get_field('page_custom_css', 12)
#1 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-includes/class-wp-hook.php(308): _kalium_page_custom_css(Object(WP))
#2 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#3 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#4 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-includes/class-wp.php(797): do_action_ref_array('wp', Array)
#5 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-includes/functions.php(1334): WP->main('')
#6 /customers/d/d/0/danieleguidugli.com/httpd.www/wp-blog-header.php(16): wp()
#7 /customers/d/d/0/danieleguidugli.com/httpd.www/index.php(17): require('/customers/d/d/...')
#8 {main}
  thrown in /customers/d/d/0/danieleguidugli.com/httpd.www/wp-content/themes/kalium/includes/classes/compatibility/kalium-acf.php on line 62