In case you've been using MF Pro or any other sports bot with a zero account, here is a big warning for you (quoted from BetFair's newsletter):
On Thursday 25th July, we are making a change to the Betfair API that means that only customers with a funded account will be able to log into the API. Customers that have never funded their Betfair account will receive the error PRODUCT_REQUIRES_FUNDED_ACCOUNT when attempting to login.
Note the word "never" in the context. Go and deposit at least £5 to be able to keep using the bot.