Uncaught Error: Call to a member function query() on null in C:\xampp\htdocs\leadcust\update.php:169 Stack trace: #0 {main} thrown in code example

Example: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\facultate\CosCump\product.php:5 Stack trace: #0 {main} thrown in C:\xampp\htdocs\facultate\CosCump\product.php on line 5

try{
    	$conn = new PDO("mysql: host = localhost; dbname = php_crud", 'root', '');

    	    $pdo = $conn->query("SELECT * FROM data");

    	    $pdo->setFetchMode(PDO:: FETCH_ASSOC);

    	while($row = $pdo->fetch()) {
	        	echo $row['email'] . "<br>";
        	}
    }

    catch(PDOException $e) {
	    echo "Error: " . $e->getMessage();
    }