function uuidv4() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
var GUID = uuidv4()
END SCRIPT -> VARS "GUID" ```
Remove the BEGIN SCRIPT and END SCRIPT line, they are not needed anymore. And then add an output variable of type string called GUID (remove the existing one). Done.