Chapter 6 - script source not found

I'm having some issue, with the jsop, because when i put the script with the src="gumball.wickedlysmart.com/?callback=updateSales" the browser's console says me this: 

GET http://gumball.wickedlysmart.com/?callback=updateSales net::ERR_NAME_NOT_RESOLVED

I think the url isn't available any more.
Is there anyone can help me?