Notice: Undefined variable: userIds in /var/www/pung2/bot/push1.php on line 66

Fatal error: Uncaught TypeError: Argument 1 passed to LINE\LINEBot::multicast() must be of the type array, null given, called in /var/www/pung2/bot/push1.php on line 66 and defined in /var/www/pung2/bot/vendor/linecorp/line-bot-sdk/src/LINEBot.php:210 Stack trace: #0 /var/www/pung2/bot/push1.php(66): LINE\LINEBot->multicast() #1 {main} thrown in /var/www/pung2/bot/vendor/linecorp/line-bot-sdk/src/LINEBot.php on line 210