This means that the PayPal account you have linked is unable to receive payments, you will have to take up the issue with PayPal as it is outside our control. There may be a notification on your dashboard with more information.
I Have linked only my bank account with paypal not the credit or debit card. Is a credit or debit card must be linked for the payment?
No, payouts are sent to PayPal. Your problem is on the PayPal side. They don't require a linked card either.