What does it mean when you dream of a ghost attacking you?

Well it depends on the ghost,i mean who is that ghost.For me, if that ghost is someone that you know,or might be for example your bf/gf,maybe that ghost have something to tell you,he/she might have an unfinished business with you however if that ghost is one of your enemy,either of the two:a)he/she would ask an apology for your peace of mind,or b) he/she might want to give you nightmare to be with him/her in hell or luckily if in heaven.