Dreaming of a haunted house indicates that guilt from the past is holding you back from accomplishing something you really want.
Actually seeing a ghost, however, is an omen of good luck.
If you are frightened by a ghost, this could mean that mistakes in your past have “come back to haunt you.” It could also mean that intense pressure to do something against your principles could be put upon you by someone in a position of authority.
If the ghost is someone known to you who has passed on and who speaks to you, listen.
The message is important.