The issue is exactly what the error says the issue is:
session.save_path has a bad value in the php.ini file. You will need to contact godaddy support and have them address it.
Don't give them any background information that might confuse them. Just show them the two extremely simple pages I had you make and they should be able to fix it for you. I've seen this dozens of times on GoDaddy and they always fix it once the problem is clearly identified to them.