Secure requests with wp_nonce

Including nonce in this plugin would be great. I tried to do it myself, with this on the client side:

jQuery(document).ready(function(){
    jQuery('.clickme-btn').on('click', function(){
        var data = {
			'security': '<?php echo wp_create_nonce('load_post'); ?>'
        }
		jxAction('click_action1',data);
    });
});

and this on the PHP side (function.php)

add_action('jx_click_action1', function($jx){
    check_ajax_referer('load_post', $jx->data['security'],true);    
    $jx->alert('Hello, world!');
});

But this is what is returned

Wrong jx JSON response (not JSON): Forbidden jx.js:136:12