Setting Ethternet MAC ATSAM3x8e

Hello! When the input frame interrupt is triggered by the OVR bit(receive overrun) in the registry EMAC_RSR. Description this bit tells the DMA that are unable to take the frame, because not provided during the bus or because "a not OK hresp(bus error) was returned". What is hresp and what is bus error? How to fix this problem?