If phantasmaphobia is a fear of phantasms or a fear of apparitions, then warning signs would be an unrealistc fear of ghosts, ghost hunting, haunted sites and locations and haunted objects. A person suffering from phantasmaphobia would also likely avoid watching anything dealing with ghosts or ghost hunting.
Phasmaphobia is the fear of ghosts or phantoms. The correct word is "phantasmaphobia". Xox, Smartiiz.