"Class, struct, or interface method must have a return type" (27032)

error:
error CS1520: Class, struct, or interface method must have a return type

script:

public class Skill : ModifiedStat {
	 private bool _known; 
	
	public Skill() {
		_known = false;
		ExpToLevel = 25;
		LevelModifier = 1.1f;
	}
	
	public bool Known {
		get{ return _known;}
		set { _known = value;}
	}
}

public enum SkillName{
	Melee_Offence,
	Melee_Defence,
	Ranged_Offence,
	Ranged_Defence,
	Magic_Offence,
	Magic_Defence
}

What line is it choking on?

well only difference i see is mine is 24 lines not 23 like yours, under “LevelModifier = 1.1f;” there is a blank line before the }.