Split Undefined

Hi- I recently downloaded this theme to WordPress, however each time I attempt to 'Customize' the site, I receive the following message: TypeError: elt.url.split is not a function. (In 'elt.url.split('/')', 'elt.url.split' is undefined) I tried a different browser to no avail. My dashboard appears to be working fine, but again, I can't edit the site through the Customizer - a spinning area appears as if the page is trying to load, but that's it.