Hi Jolin,
The cause of error can be different reasons, so please go throuth the steps like;
1) Check your Invoice amount and your bank available amounts, if you exceeds the morethan your available amount of your invoice amount,then you face the problem (ie: in FBZP)
2) Check whether your payment method "C" assigned in vendor master or not, if not you must assign the payment method "C" in the vendor master.
3) If above are mintained above two steps then finally Check FBZP settings
Regards
Dileep