how can I fix this errors?

When I import this script into Unity, it shows that
Type ‘UnityEngine.GameObject’ does not contain a definition for ‘transforms’ and no extension method ‘transforms’ of type ‘UnityEngine.GameObject’ could be found.
How can I fix this problem?

Because there is no method named transforms but transform in GameObject class … remove letter s form there

Accept if helps

use transform instead of transforms :

public Slider seaLevelRiseSlider;
public GameObject oceanPlane;

private Vector3 _seaLevel;

void Start()
{
	_seaLevel = new Vector3 (0,0,0);
	_seaLevel = oceanPlane.transform.position;
}

public void SeaLevelChange()
{
	SeaLevel = seaLevelRiseSlider.value;
	oceanPlane.transform.position = new Vector3 (oceanPlane.transform.position.x,SeaLevel*10,oceanPlane.transform.position.z);
}

public float SeaLevel
{
	get {
		return _seaLevel.y;
	}
	set {
		_seaLevel.y = value;
	}
}