I need a little help

using UnityEngine;

using UnityEngine.UI;

using System.Collections;

using UnityEngine.Component;

public class AntiRollBars : MonoBehaviour { public WheelCollider leftWheelCollider;

 public WheelCollider rightWheelCollider;
 //
 public float antiRollPressure = 5000.0f;
 //
 private WheelHit hit;
 //
 private float leftSideTravel = 1.0f;
 private float rightSideTravel = 1.0f;
 //
 private float antiRollForce = 0.0f;
 //
 
 //
 void FixedUpdate ()
 {

     bool leftWheelGrounded = leftWheelCollider.GetGroundHit (out hit);
     
     if (leftWheelGrounded == true) {
         leftSideTravel = (-leftWheelCollider.transform.InverseTransformPoint (hit.point).y - leftWheelCollider.radius) / leftWheelCollider.suspensionDistance;
     }
     
     bool rightWheelGrounded = rightWheelCollider.GetGroundHit (out hit);
     
     if (rightWheelGrounded == true) {
         rightSideTravel = (-rightWheelCollider.transform.InverseTransformPoint (hit.point).y - rightWheelCollider.radius) / rightWheelCollider.suspensionDistance;
     }
     
     antiRollForce = (leftSideTravel - rightSideTravel) * antiRollPressure;
     
     if (leftWheelGrounded == true) {
         rigidbody.AddForceAtPosition (leftWheelCollider.transform.up * -antiRollForce, leftWheelCollider.transform.position);
     }
     
     if (rightWheelGrounded == true) {
         rigidbody.AddForceAtPosition (rightWheelCollider.transform.up * antiRollForce, rightWheelCollider.transform.position);
     }
 }

}

Text error : Assets/Sandrail/Scripts/AntiRollBars.cs(4,1): error CS0138: A using' directive can only be applied to namespaces but UnityEngine.Component' denotes a type. Consider using a `using static' instead