Innovator is not defined Client Side Error

I've got a very simple method that creates a new PR from a button on a TGV.  This worked perfectly in V12, but is not working in our V15 instance.  Any help would be greatly appreciated!

The error message is: The method 'create_PR_from_tgv' failed. Innovator is not defined Client Side Error

The code is below:

var inn = new Innovator();

var pr = inn.newItem("PR","add");
pr.setProperty("parent", thisItem.getID());

top.aras.uiShowItemEx(pr.node, "tab view", true, true);