Fatal error: Uncaught Error: Call to undefined function wp_theme_has_theme_json() in /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php:78 Stack trace: #0 /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php(42): Cartflows_Init_Blocks->__construct() #1 /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php(586): Cartflows_Init_Blocks::get_instance() #2 /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-block-loader.php(64): require_once('/home/users/2/s...') #3 /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-block-loader.php(44): Cartflows_Block_Loader->load_plugin() #4 /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/clas in /home/users/2/smilepapa/web/shigedomi.jp/wp/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php on line 78