Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /home/ss561246/ss561246.stars.ne.jp/public_html/webhook.php on line 3

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/opt/php-7.2.34-5/data/pear') in /home/ss561246/ss561246.stars.ne.jp/public_html/webhook.php on line 3