Fatal error: Uncaught TypeError: array_rand(): Argument #1 ($array) must be of type array, null given in /home/kairanban/kairanban.cloudfree.jp/public_html/zatsugaku/index.php:10 Stack trace: #0 /home/kairanban/kairanban.cloudfree.jp/public_html/zatsugaku/index.php(10): array_rand(NULL) #1 {main} thrown in /home/kairanban/kairanban.cloudfree.jp/public_html/zatsugaku/index.php on line 10