Why this error? Parse error: syntax error, unexpected T_ELSE
I'm making a system to change my password and I don't know why I am getting this error.
I have this error message: Parse error: syntax error, unexpected T_ELSE in /home/zenonhos/public_html/system/changepass.php on line 37
        <?php
    session_start();
    
    $user = $_SESSION['username'];
    
    if ($user)
    {
    
    if ($_POST['submit'])
    {
    $oldpassword = md5($_POST['oldpassword']);
    $newpassword = md5($_POST['newpassword']);
    $repeatnewpassword = md5($_POST['repeatnewpassword']);
    
    
    $connect = mysql_connect("*******","******","*****");
    mysql_select_db("zenonhos_lr");
    
    $queryget = mysql_query("SELECT `password` FROM `users` WHERE username='$user'") or die();
    $row = mysql_fetch_assoc($queryget);
    $oldpassworddb = $row['password']; 
    
    if ($oldpassword==$oldpassworddb)
    {
    if ($newpassword == "") {
    echo "Password cannot be blank";
    } else {
    
    if ($newpassword==$repeatnewpassword)
    {
    $querychange = mysql_query("UPDATE `users` SET password='$newpassword' WHERE username='$user'");
    
    session_destroy();
    die("Password successfully changed! <a href='index.php'>Return to home page</a>");
    } else {
    die("New passwords do not match");
    } else {
    die("Old password does not match");
    } echo "<form action='changepass.php' method='POST'>
    Old Password: <input type='password' name='oldpassword'><br>
    New Password: <input type='password' name='newpassword'><br>
    Repeat New Password: <input type='password' name='repeatnewpassword'><br>
    <input type='submit' name='submit' value='Change Password'>";
    } else {
    die("You must be logged in to view this page.");
    }
    
    
    
    
    
    
    
    ?>
Why this error? Parse error: syntax error, unexpected T_ELSE
===

I'm making a system to change my password and I don't know why I am getting this error.
I have this error message: Parse error: syntax error, unexpected T_ELSE in /home/zenonhos/public_html/system/changepass.php on line 37
        <?php
    session_start();
    
    $user = $_SESSION['username'];
    
    if ($user)
    {
    
    if ($_POST['submit'])
    {
    $oldpassword = md5($_POST['oldpassword']);
    $newpassword = md5($_POST['newpassword']);
    $repeatnewpassword = md5($_POST['repeatnewpassword']);
    
    
    $connect = mysql_connect("*******","******","*****");
    mysql_select_db("zenonhos_lr");
    
    $queryget = mysql_query("SELECT `password` FROM `users` WHERE username='$user'") or die();
    $row = mysql_fetch_assoc($queryget);
    $oldpassworddb = $row['password']; 
    
    if ($oldpassword==$oldpassworddb)
    {
    if ($newpassword == "") {
    echo "Password cannot be blank";
    } else {
    
    if ($newpassword==$repeatnewpassword)
    {
    $querychange = mysql_query("UPDATE `users` SET password='$newpassword' WHERE username='$user'");
    
    session_destroy();
    die("Password successfully changed! <a href='index.php'>Return to home page</a>");
    } else {
    die("New passwords do not match");
    } else {
    die("Old password does not match");
    } echo "<form action='changepass.php' method='POST'>
    Old Password: <input type='password' name='oldpassword'><br>
    New Password: <input type='password' name='newpassword'><br>
    Repeat New Password: <input type='password' name='repeatnewpassword'><br>
    <input type='submit' name='submit' value='Change Password'>";
    } else {
    die("You must be logged in to view this page.");
    }
    
    
    
    
    
    
    
    ?>