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Fatal error: Uncaught Kreait\Firebase\Exception\InvalidArgumentException: A uid must be a non-empty string with at most 128 characters. in /var/www/html/IDP/Firebase_old/vendor/kreait/firebase-php/src/Firebase/Value/Uid.php:19 Stack trace: #0 /var/www/html/IDP/Firebase_old/vendor/kreait/firebase-php/src/Firebase/Auth.php(78): Kreait\Firebase\Value\Uid->__construct() #1 /var/www/html/IDP/Firebase_old/index.php(29): Kreait\Firebase\Auth->getUser() #2 {main} thrown in /var/www/html/IDP/Firebase_old/vendor/kreait/firebase-php/src/Firebase/Value/Uid.php on line 19