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);

     }
 }

}