error CS0122: `CharacterMotorC.SetVelocity(UnityEngine.Vector3)' is inaccessible due to its protection level

I don’t understand why this error has popped up.

error CS0122: `CharacterMotorC.SetVelocity(UnityEngine.Vector3)’ is inaccessible due to its protection level

Heres my script:

using UnityEngine;
using System.Collections;

public class Bounce : MonoBehaviour {

public int strength = 100; 


void OnTriggerEnter(Collider other)

{

if (other.gameObject.tag == “Player”)
{
other.gameObject.GetComponent().SetVelocity(Vector3.up * strength);

	}
}

}

The CharacterMotor part didn’t show up in the script on here.