Image zoom doesn’t work

Hello,
I need to use Image Zoom, but when I activate it, it doesn’t work at all.
It works fine with other themes but it doesn’t work with mine.
I have “<?php wp_footer();?>” code in my footer and I tried to deactivate all other plugins, but they did not work.
Other lightbox plugins are the same.
In addition I wrote all the theme codes myself, so I think the problem is with my theme but I can’t find it
Thanks for your help.