A return keyword must not be followed by any expression when method returns void

Unity Engine
1

Any help is always greatly appreciated

(25,17)A return keyword must not be followed by any expression when method returns void
(25,17)Cannot implicitly convert type UnityEngine.Color' to void’

public Texture graphic;
	public Color GUIColor;
	
	void OnGUI() {
		GUI.color = GUIColor;
		if (graphic) {
			GUI.DrawTexture(new Rect(10,10,
							Screen.width,Screen.height),
							graphic,ScaleMode.StretchToFill,true);
		}
	}

	
	public void AlphaUp(float change) {
		if (GUIColor.a < 1) {
			GUIColor.a += change;
		}
	}
	
	public void setStartColor(Color color) {
		GUIColor = color;
	}
	
	public void getColor() {
		return GUIColor;
	}
	
	public void setDelay(float delay) {
		if (GUIColor.a > .5) {
			GUIColor.a += delay;
		} else {
			GUIColor.a -= delay;
		}
	}
	
	public void AlphaDown(float change) {
		if (GUIColor.a > 0) {
			GUIColor.a -= change;
		}

	}
2

Fix line 24: replace “void” with “Color”

3

Thanks