Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens

I am new to php .I have checked values so many time, they are same in database too . I am getting this error: Fatal error: Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens in C:\xampp\htdocs\sms\createAboutTest.php:26 Stack trace: #0 C:\xampp\htdocs\sms\createAboutTest.php(26): PDOStatement->execute() #1 {main} thrown in C:\xampp\htdocs\sms\createAboutTest.php on line 26 I don't know what's wrong with my code :( . thankyou for your help in advance:

$pdo = new PDO('mysql:host=localhost;port=3306;dbname=testconductingportal', 'root', '');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$t_id = $_POST['t_id'];
$t_name= $_POST['t_name'];
$ins_name = $_POST['ins_name'];
$t_date = $_POST['t_date'];
$t_time = $_POST['t_time'];
$t_duration= $_POST['t_duration'];
$t_fee = $_POST['t_fee'];
$t_savedate = $_POST['t_savedate'];
$t_closing_date  = $_POST['t_closing_date'];
$t_description = $_POST['t_description'];
$statement= $pdo->prepare("INSERT INTO about_test (t_id, t_name, ins_name, t_date, t_time, t_duration, t_fee, t_savedate, t_closing_date, t_description)
VALUES(:t_id, :t_name, :ins_name, :t_date, :t_time, :t_duration, :t_fee, :t_savedate, :t_closing_date', :t_description')");
$statement->bindvalue(':t_id', $t_id);
$statement->bindvalue(':t_name', $t_name);
$statement->bindvalue(':ins_name', $ins_name);
$statement->bindvalue(':t_date', $t_date);
$statement->bindvalue(':t_time', $t_time);
$statement->bindvalue(':t_duration', $t_duration);
$statement->bindvalue(':t_fee', $t_fee);
$statement->bindvalue(':t_savedate', $t_savedate);
$statement->bindvalue(':t_closing_date', $t_closing_date);
$statement->bindvalue(':t_description', $t_description);
$statement->execute();
?>