I am trying to use jQuery Sortable for my custom Kanban, and I keep getting an error.

this is the code that applies the sortable property after the page has loaded.
 

get loadedCard(){
        $(this.template.querySelector('.sortable')).sortable();
    }

.
I have imported both jQuery and jQueryUI to the component.
 

import jQuery from '@salesforce/resourceUrl/jQuery';
import jQueryUI from '@salesforce/resourceUrl/jQueryUI';

I have another using jQuery slide functionality, and it worse just fine. 
 
Any help will be highly appreciated.