O construtor não esta reconhecendo o \DateTimeImmutable dentro do foreach

A linha 22 é a da data de nascimento, tentei colar o código da aula pensando que eu avia feito algo de errado mas não resolveu

erro:

PHP Fatal error: Uncaught TypeError: Argument 2 passed to Alunos\Student::__construct() must be of the type string, null given, called in C:\Users\pheli\OneDrive\Documentos\php\Alunos\buscarAluno.php on line 22 and defined in C:\Users\pheli\OneDrive\Documentos\php\Alunos\Student.php:11 Stack trace:

#0 C:\Users\pheli\OneDrive\Documentos\php\Alunos\buscarAluno.php(22): Alunos\Student->__construct(1, NULL, Object(DateTimeImmutable))

#1 {main} thrown in C:\Users\pheli\OneDrive\Documentos\php\Alunos\Student.php on line 11

Fatal error: Uncaught TypeError: Argument 2 passed to Alunos\Student::__construct() must be of the type string, null given, called in C:\Users\pheli\OneDrive\Documentos\php\Alunos\buscarAluno.php on line 22 and defined in C:\Users\pheli\OneDrive\Documentos\php\Alunos\Student.php:11 Stack trace:

#0 C:\Users\pheli\OneDrive\Documentos\php\Alunos\buscarAluno.php(22): Alunos\Student->__construct(1, NULL, Object(DateTimeImmutable))

#1 {main} thrown in C:\Users\pheli\OneDrive\Documentos\php\Alunos\Student.php on line 11

    $databasePath = __DIR__ . '/banco.sqlite';
    $pdo = new PDO('sqlite:' . $databasePath);

    $statement = $pdo->query('SELECT * FROM students;');
    $studentDataList = $statement->fetchAll(PDO::FETCH_ASSOC);
    $studentList = [];

    foreach ($studentDataList as $studentData) {
        $studentList[] = new Student(
            $studentData['id'],
            $studentData['name'],
            new \DateTimeImmutable($studentData['birth_date'])
        );
    }

    var_dump($studentList);

o construtor não mudei nada