paypal is a retarded company...
go to ur settings for banking information in paypal. you probably have your "Debit" account selected as primary method of payment. it means that it tries to take the money from there instead of ur paypal account... it happened to me once... when i had a visa on it, its retarded... (keep in mind that, since reserved slot is a "subscription" payment, monthly i mean, it means that you need to have an account that allows "instant payment" from paypal, or a backup funding source, like a card or so, in order to allow the monthly subscription, just in case u decide to fuck with paypal.
nways, do that and make sure u have the money before it's requested to withdraw or else paypal (the idiots again) might decide to close down ur account for "suspected behavior" if u're short on money to pay... fucking fucks... (i hate paypal btw, if u noticed...)...
another idea would be to get one of ur friends to buy u a prepaid visa card, activate it online with ur paypal address and u should be ok (u neeed to confirm the visa address by going to that visa company/mastercard company) and fill in ur address exactly like paypal BEFORE you click on "make credit card payments instantly" in paypal... bcos paypal will go compare ur addresses there...
i would strongly suggest using the prepaid visa... if paypal closes ur account or freezes ur money , u're fucked, its always better to not have money on paypal... trust me , i lost 600$ with them...