These errors are usually caused by bad/failed casting or improperly set up references . So make sure you’re reference variables are setup properly , are not null and valid.
Also you get these errors if for example you are trying to access a private variable or function from outide it’s derived class or bp class therefore you may have to make the variable or function public
Are you on the unreal course by any chance ? I noticed you’re project name is escape the room :-p