Fatal error: Uncaught TypeError: usort(): Argument #1 ($array) must be of type array, null given in /home/xs818553/travel-japan-now.jp/public_html/wp-content/themes/travel_japan/single-spots.php:81 Stack trace: #0 /home/xs818553/travel-japan-now.jp/public_html/wp-content/themes/travel_japan/single-spots.php(81): usort(NULL, Object(Closure)) #1 /home/xs818553/travel-japan-now.jp/public_html/wp-includes/template-loader.php(106): include('/home/xs818553/...') #2 /home/xs818553/travel-japan-now.jp/public_html/wp-blog-header.php(19): require_once('/home/xs818553/...') #3 /home/xs818553/travel-japan-now.jp/public_html/index.php(17): require('/home/xs818553/...') #4 {main} thrown in /home/xs818553/travel-japan-now.jp/public_html/wp-content/themes/travel_japan/single-spots.php on line 81