Help with some code Please

Help with some code Please

Hi,

Could someone please tell me what is wrong with this code...

myUrl1 = ((("https://creatorexport.zoho.com/" + zoho.adminuser) + "/") + zoho.appname) + "/print/";
rec = input.Job_Number;
myUrl3 = "/fame=" + rec.ID;
myUrl = myUrl1 + "Invoice" + myUrl3;
openUrl(myUrl, "new window");

It is in the app new starlight digital which I have enabled for you if you need it.

I have a feeling I have done the rec variable wrong but I am not sure.

The code is attached to the action on user input of the print button on the bottom left of the jobs page. It then links to the invoice page. 

I know I am close but cant get it right.

Thanks