NEXTGEN GALLERY – SLIDESHOW

Hello, another problem I’m facing,

https://eugeniomussak.com.br/minhas-ideias/o-que-escrevi/artigo/

in the sidebar, I call a slidshow using this:
<?php
if (function_exists(“nggSlideshowWidget”))
nggSlideshowWidget(8,200,200);
?>

but the only think that show me is the loading gif image.
Has someone go through the same problem?

And sorry about my english.