"Snap!Cloud - Could not save project" Error Fix?

^^Got that error when I was trying to save a project.^^
I had to export it to my computer. I understand why it popped up but I only have one actual costume (not including 2 Turtles) and zero sound. As for backgrounds, the only background is all black. Is there another way to bypass this? Because I can't delete the 1 costume and 1 backdrop. Thank you very much in advance!

Oh. Nevermind. Apparently I had an unused list with a bunch of items I think 170, 000+ (not sure). You can close this.