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 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php:65
Stack trace:
#0 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-content/plugins/jetpack/modules/stats.php(33): Jetpack_Sync::sync_options('/customers/4/0/...', 'stats_options', 'home', 'siteurl', 'blogname', 'blogdescription', 'gmt_offset', 'timezone_string', 'page_on_front', 'permalink_struc...', 'category_base', 'tag_base')
#1 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-content/plugins/jetpack/class.jetpack.php(611): require('/customers/4/0/...')
#2 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-includes/class-wp-hook.php(292): Jetpack::load_modules('')
#3 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array)
#4 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#5 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-settings.php(423): do_action('plugins_loaded')
#6 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-config.php(90): require_once('/customers/4/0/...')
#7 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-load.php(37): require_once('/customers/4/0/...')
#8 /customers/4/0/1/elskarate.co.uk/httpd.www/wp-blog-header.php(13): require_once('/customers/4/0/...')
#9 /customers/4/0/1/elskarate.co.uk/httpd.www/index.php(17): require('/customers/4/0/...')
#10 {main}
  thrown in /customers/4/0/1/elskarate.co.uk/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php on line 65