CSharp script can't find th jv CharacterMotor !!

like the tilte says my script in Csharp can't find the Charactermotor, i think it's because the motor script is in java and i can't find a way to detect it! here the script.

 using UnityEngine;
 using System.Collections;
 
 public class horse : MonoBehaviour {
     CharacterController cc;
     CharacterMotor cm; // here the part
     GameObject player;
     Transform defaultPlayerTransform;
 
 
     public bool isDriving = false;
 
     // Use this for initialization
     void Start () {
         cc = GameObject.FindObjectOfType<CharacterController>();
         cm = GameObject.FindObjectOfType<CharacterMotor>(); // here where it suppose to find
         player = cm.gameObject;
         defaultPlayerTransform = player.transform.parent;
 
     //...