Storyline360, Animation and GSAP ( Greensock )

I purchased Club Greensock, and I have not been able to successfully get SplitText plugin to work. Any idea what I am missing here:
================ code ==============

//name the vars of elements on the slide
var txt1 = document.querySelectorAll("[data-acc-text='text1']");

//load in the plugins
dynamicallyLoadScripts([ 
 "https://(our server site is here)/greensock/minified/SplitText.min.js",
], onLoadScripts); 

function onLoadScripts() { 
  split = new SplitText(txt1, {type:"chars"})
  animation.from(split.chars, {opacity:0, y:50, ease:"back(4)", stagger:{
        from:"end", //try "center" and "edges"
        each:0.05
    }})
}
    

//the function that look for and loads the urls
function dynamicallyLoadScripts(urls, onComplete) { 
 if (typeof urls === "string") { 
     urls = [urls]; 
        } 
        let toLoad = urls.length; 
        urls.forEach(function(url) { 
        let script = document.createElement("script"); 
        script.src = url; 
        document.head.appendChild(script); 
        script.addEventListener("load", function() { 
             if (!--toLoad) { 
                 onComplete && onComplete(); 
         } 
     }) 
 }); 
}