`Bubble.ToggleRecent(bool)' is a `method group' but a `type' was expected

I don’t know what’s wrong

	public IEnumerator ToggleRecent(bool x)
	{
		return (IEnumerator) new Bubble.ToggleRecent();
	}
	
	public IEnumerator OnTriggerEnter(Collider c)
	{
		return (IEnumerator) new Bubble.OnTriggerEnter();
	}
	
	public void Main()
	{
	}
}

I keep getting this error

error CS0118: `Bubble.ToggleRecent(bool)' is a `method group' but a `type' was expected

error CS0118: `Bubble.OnTriggerEnter(UnityEngine.Collider)' is a `method group' but a `type' was expected

If you are trying to call the constructor of Bubble, you need parenthesis

new Bubble().OnTriggerEnter();
new Bubble().ToggleRecent();