I am attempting to create a document set in sharepoint online using JSOM triggered by a button. I've found the guides referenced here on the subject, but I can't seem to find the issue in my code.

When trying to execute the query its throwing the error: msajaxbundle.js:1 Uncaught TypeError: Cannot read property 'apply' of undefined

It seems like the Async query is failing, but im not sure why. I have also tried using list level content types and site level types with the appropriate methods for that level.

Lifeline.Functions.createCase = function(){
    context = new SP.ClientContext(_spPageContextInfo.webServerRelativeUrl);
    var listId = '7BC07117AE-8792-43DE-984A-D6EA2A533B6C';
    list = context.get_web().get_lists().getById(listId);
    var docSetName = "Projection Case: Please Work ";
    list = context.get_web().get_lists().getById(listId);

    console.log("list loaded");

    var parentFolder = list.get_rootFolder();
    console.log("parent folder loaded")

    var docSetContentTypeID = "0x0120D520";
    var docSetContentType =  context.get_site().get_rootWeb().get_contentTypes().getById(docSetContentTypeID);
    console.log("doc set content type loaded");
    context.executeQueryAsync( function(){
        console.log("doc set content query executed");

        Sp.DocumentSet.DocumentSet.create(context, parentFolder, docSetName, docSetContentType.get_id());
        context.executeQueryAsync(successHandler(), function logerror(sender,args){
    Function.createDelegate(this, this.onQueryFailed));
function successHandler(){
alert("Document Set successfully Created");
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());

So I wasn't able to fix the code to resolve the error. However I was able to get this working using an alternate method that seems much simpler. Hopefully it will help those who are also having difficulty executing this using DocumentSet.DocumentSet.create method

Lifeline.Functions.createCase = function(itemid) {
var docSetName = "my document set name";
var context = new SP.ClientContext(_spPageContextInfo.webServerRelativeUrl);
var list = context.get_web().get_lists().getById('LIST GUID');
var item;

var itemCreateInfo = new SP.ListItemCreationInformation();

item = list.addItem(itemCreateInfo);
item.set_item("ContentTypeId", "0x0120D52000307A54BE1A445A44813BEDE85E22CADB");
item.set_item('Title', docSetName);
item.set_item('DocumentSetDescription', "This is test 3 an automatically generated description");
item.set_item('ChartIdlookup', itemid);

    function() { console.log("document-set created!");} ,
    function(sender,args) { console.log("Error: " + args.get_message()); }


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