There can be various reasons for the message however, we have no details about your account setup, first question is - is your PayPal account verified ?? Meaning you have linked both a bank account and credit card. If your account is unverified, there are limits for both sending, receiving and withdraws. (In some cases, you're pompted to pick another funding source because the one you chose may not have sufficient funds and/or you don't have a backup funding source.)
