Unable to create Folder -object in JS - only works in JSX

Specifying a path changes nothing for me - the object is still not created, instead the code comes to a halt before the second alert. Also doing theFolder.create() does nothing either

EDIT: I even tried hardcoding the folder path and also make sure that the folder didn't exist already, but for reasons unknown the Folder-object is still not created.

fontAbsPath = "c:/Users/martin.dahlin/Desktop/Test/";
alert("trying to make folder... fontAbsPath is:\n" + fontAbsPath); // This is correct
var fontFolder = new Folder(fontAbsPath); // Script HALTS here! :(
if(!fontFolder.exists){
    alert("created folder because it didn't exist");
    fontFolder.create();
}else{
    alert("didn't create the folder because it already exists!");
}