Insufficient remaining store credit
Keeps popping up every time I want to buy something and I have enough money it is just not working. Then when I type my password it takes me to my wallet settings.
I haven't seen this one in a while.
Go to Settings > iTunes & App Store > Apple ID and check your payment information is current. Even if you only want something that is free this will be required if you already have any payment form on record.
If you still have a problem contact Apple:iTunes Store - Contact Us - https://www.apple.com/emea/support/itunes/contact.html