PayPal not working after clicking Buy Now

I have create PayPal buy now on PayPal but when I get the HTML code that provide by PayPal and try it, it's not working. Here is the code that provide by PayPal :

 <form action="http://ift.tt/rDmnwQ" method="post" target="_top">
    <input type="hidden" name="cmd" value="_s-xclick">
    <input type="hidden" name="hosted_button_id" value="A86U9CK5PE8N8">
    <table>
        <tr>
            <td>
                <input type="hidden" name="on0" value="Annual Subscription">Annual Subscription</td>
        </tr>
        <tr>
            <td>
                <select name="os0">
                    <option value="1 Year">1 Year RM57.00 MYR</option>
                </select> 
            </td>
        </tr>
    </table>
    <input type="hidden" name="currency_code" value="MYR">
    <input type="image" src="http://ift.tt/121CPXj" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
    <img alt="" border="0" src="http://ift.tt/rpOo6s" width="1" height="1">
</form>

This is the result after I click Buy Now :

I experience this problem after PayPal change their method on 29 March this year, before this I have no problem with creating PayPal button. Could anyone tell me what causes of this error?