Jquery Deffered: Uncaught TypeError: $.oc.builder is undefined

[Mohmdthabet]

i get this error in console:
Uncaught TypeError: $.oc.builder is undefined

jQuery.Deferred exception: $.oc.builder is undefined @filipac /plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:798:9e@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:29453
l/</t<@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:29755setTimeout handler*l/<
@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:29964c@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:27742add@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:28020then/<
@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:30060e.Deferred@/modules/backend/assets/js/vendor/jquery-migrate.min.js?v=469:213:19then@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:29989
k.fn.ready@/modules/backend/assets/js/vendor/jquery.min.js?v=469:2:31279@/plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:795:17@/plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:801:2
undefined

Uncaught TypeError: $.oc.builder is undefined
/plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:798
/plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:795
/plugins/rainlab/builder/formwidgets/formbuilder/assets/js/formbuilder.js?builder:801

i solved by replacing this line:
$(document).ready(function(){
with this line:
document.addEventListener("DOMContentLoaded", function(event) {

because jquery was not loaded yet.