Fatal error: Uncaught Kreait\Firebase\Exception\InvalidArgumentException: The child key "sitemap.xml" contains one of the following invalid characters: ".$#[]" in /www/wwwroot/mymobiledrive.com/www/vendor/kreait/firebase-php/src/Firebase/Database/Reference/Validator.php:64 Stack trace: #0 /www/wwwroot/mymobiledrive.com/www/vendor/kreait/firebase-php/src/Firebase/Database/Reference/Validator.php(31): Kreait\Firebase\Database\Reference\Validator->validateChars() #1 /www/wwwroot/mymobiledrive.com/www/vendor/kreait/firebase-php/src/Firebase/Database/Reference.php(47): Kreait\Firebase\Database\Reference\Validator->validateUri() #2 /www/wwwroot/mymobiledrive.com/www/vendor/kreait/firebase-php/src/Firebase/Database.php(71): Kreait\Firebase\Database\Reference->__construct() #3 /www/wwwroot/mymobiledrive.com/www/db.php(29): Kreait\Firebase\Database->getReference() #4 /www/wwwroot/mymobiledrive.com/www/app.php(19): require_once('/www/wwwroot/my...') #5 {main} Next Kreait\Firebase\Exception\InvalidArgumentException: The child key " in /www/wwwroot/mymobiledrive.com/www/vendor/kreait/firebase-php/src/Firebase/Database.php on line 73