Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-content/plugins/jetpack/class.jetpack-sync.php:74 Stack trace: #0 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-content/plugins/jetpack/modules/stats.php(24): Jetpack_Sync::sync_options('/home/egfujieda...', 'stats_options', 'home', 'siteurl', 'blogname', 'blogdescription', 'gmt_offset', 'timezone_string', 'page_on_front', 'permalink_struc...', 'category_base', 'tag_base') #1 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-content/plugins/jetpack/class.jetpack.php(1142): require('/home/egfujieda...') #2 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-includes/class-wp-hook.php(286): Jetpack::load_modules('') #3 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #4 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #5 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-settings.php(327): do_action('plugins_loaded') #6 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-config.php(93): require_once('/home/egfujieda...') #7 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-load.php(37): require_once('/home/egfujieda...') #8 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-blog-header.php(13): require_once('/home/egfujieda...') #9 /home/egfujieda/fujieda-eg.jp/public_html/wordpress/index.php(17): require('/home/egfujieda...') #10 {main} thrown in /home/egfujieda/fujieda-eg.jp/public_html/wordpress/wp-content/plugins/jetpack/class.jetpack-sync.php on line 74