unitegallery.min.js:8 Uncaught Error: The gallery can't run without theme

[TLINDEN]

Just tried it out on an almost empty site. The Plugins JS and CSS is loaded and the HTML code rendered from the twig template. However, the gallery doesn't render in the browser, JS error console shows:

unitegallery.min.js:8 Uncaught Error: The gallery can't run without theme
    at validateParams (unitegallery.min.js:8)
    at runGallery (unitegallery.min.js:8)
    at UniteGalleryMain.run (unitegallery.min.js:9)
    at n.fn.init.jQuery.fn.unitegallery (unitegallery.min.js:10)
    at HTMLDocument.<anonymous> (gallerie:121)
    at i (jquery-2.x.min.js:2)
    at Object.fireWith [as resolveWith] (jquery-2.x.min.js:2)
    at Function.ready (jquery-2.x.min.js:2)
    at HTMLDocument.J (jquery-2.x.min.js:2)

URL: http://34.67.216.167/fish/gallerie
Content Repository: https://github.com/TLINDEN/gravititate-backwards