Variaitions not loading

Hello,

I want to add a variation from my wordpress dashboard but I am not able to do.

I am getting an error in console bar.

Uncaught Error: Option ‘ajax’ is not allowed for Select2 when attached to a <select> element.
at String.<anonymous> (ultimate-woocomposer-backend.min.js?ver=4.7.3:1)
at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mo…:2)
at d.prepareOpts (ultimate-woocomposer-backend.min.js?ver=4.7.3:1)
at d.prepareOpts (ultimate-woocomposer-backend.min.js?ver=4.7.3:2)
at d.init (ultimate-woocomposer-backend.min.js?ver=4.7.3:1)
at HTMLSelectElement.<anonymous> (ultimate-woocomposer-backend.min.js?ver=4.7.3:2)
at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mo…:2)
at a.fn.init.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,jquery-ui-core,jquery-ui-widget,jquery-ui-mo…:2)
at a.fn.init.a.fn.select2 (ultimate-woocomposer-backend.min.js?ver=4.7.3:2)
at HTMLSelectElement.<anonymous> (wc-enhanced-select.min.js:1)

Can you please help me solve this issue.