Plugin not working

I´m not exactly sure if I´m doing something wrong, but here it goes:

I´m using your plugin on my bands site (still WIP: http://www.thejunglebuds.com) and I hid the text, since I only wanted a small heart-icon to be displayed, now to this point everything is fine, it gets shown where it should, but when I click it now, I get no error, it just jumps to the top of the page (so I guess some script isn´t loading?).

I embedded the likes in two template files via “<?php printLikes(get_the_ID()); ?>”, so I guess I´m just missing something obvious?

https://ww.wp.xz.cn/plugins/roses-like-this/