Doesn´t work in wp3.5?

Hi,

I´m trying to use your plugin in 3.5 but it doesn´t work, I add:
<?php if(function_exists(‘wp_slider’)): wp_slider(‘Prueba’); endif; ?>
On text label when creating a page but it doesn´t show nothing.

Thanks in advance

http://ww.wp.xz.cn/extend/plugins/wp-slider/