Wordpress Ajax - Js error 400(bad request) - php

Question

It's getting the link to the word press ajax file but giving me a bad request error.
The exact error im getting is POST http://[Website URL]/wp-admin/admin-ajax.php 400 (Bad Request)
Functions.php file
function as_custom_ajax_localizing() {
wp_enqueue_script( 'custom.js', get_template_directory_uri() . '/guest-list/custom.js', array( 'jquery' ), '1.0.0', true );
wp_localize_script( 'custom.js', 'MyAjax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );
}
add_action( 'wp_enqueue_scripts', 'as_custom_ajax_localizing' );
Custom php file
add_action( 'wp_ajax_my_delete_post', 'as_delete_guest' );
function as_delete_guest(){
$permission = check_ajax_referer( 'as_delete_guest_nonce', 'nonce', false );
if( $permission == false ) {
echo 'error';
} else {
wp_delete_post( $_REQUEST['id'] );
echo 'success';
}
die();
}
Custom Js file
$( document ).ready(function() {
$( ".remove_guest" ).click(function() {
var guestRowId = $(this).attr('id');
alert( "This id is " + guestRowId + " and has been clicked");
var nonce = $(this).data('nonce');
$.ajax({
type: 'post',
url: MyAjax.ajaxurl,
data: {
action: 'my_delete_post',
nonce: nonce,
id: guestRowId
},
success: function( result ) {
if( result == 'success' ) {
alert("Success");
}
else{
alert("problem");
}
}
})
return false;
});
});