Whenever I try and purchase an app from the market it asks me to put in my card details but keeps saying there was an error. I've done it about 4 times now but it keeps failing. I'm in the UK trying to pay on a Visa Debit card. The only option is to pay with a credit card, is that where the problem is? I'm not getting a credit card just to buy some apps for my phone! Surely there's another way??