How do i...insert data in database with the help of PHP pdo

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PHP

I am geting "!Fatal error: Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: parameter was not defined." while trying to insert data in local host phpmyadmin. Here is my source code.

What I have tried:

<?php
include_once('config.php');
if(isset($_POST['submit']))
{   
    $uname = $_POST['nm'];
    $uaddress = $_POST['add'];
    $uemail = $_POST['em'];
    $ugender = $_POST['gen'];
    $udob = $_POST['dob'];
    $udeg = $_POST['des'];
    $upass = $_POST['pass'];

//Insertion of values in an array
    $data = [
        'name' => $uname,
        'addr' =>  $uaddress,
        'email' => $uemail,
        'gender' => $ugender,
        'dob' => $udob,
        'degi' => $udeg

    ];

    //Prepairing SQL insert query
    $sql = "INSERT INTO users (name, address, email, gender, date_of_birth, designation) VALUES (:name, :addr, :email, :gender, :dob, :deg )";
    $stmt = $conn->prepare($sql);
    $stmt->execute($data);
}
?>