select HorrorEngineGameMode
use BP_HideEasilyController
Click on the element circled in green in the attached image.
in the window that opened, search for "HorrorEngineCharacter"
If it doesn't appear, look for it [above you have the address]
all/Content/Hide_easily/Demo/FirstPersonBP/Blueprints
click Add and select BI_HideUnderBed
copy all events from this box [ <- left image]
drag from Components and drop on ERROR variables
Player Camera <=> First Person Camera
Mesh <=> Skeletal Mesh