ERROR CS0029: Cannot implicitly convert type `UnityEngine.GameObject' to `TriggerSphere'

Hello

I have this error (11,39): error CS0029: Cannot implicitly convert type UnityEngine.GameObject' to TriggerSphere' but I don't found how to fix in this code

 using UnityEngine;
 using System.Collections;
 
 public class Character : MonoBehaviour {
     public TriggerSphere ts;
     
     private bool isJumping = false;
     private GameObject moveToward;
     void Update() {
         if( isJumping && Input.GetKeyDown(KeyCode.A) && moveToward == null ) {
             TriggerSphere tsClone = Instantiate( ts, transform.position, Quaternion.identity ) as GameObject;
             tsClone.character = gameObject;
         }
         
         if( moveToward != null ) {
             /* Note : B */
         }
     }
     
     void OnCollisionEnter( Collision collision ) {
         if( collision.gameObject.CompareTag("CanHit") ) {
             isJumping = false;
             /* Note : C */
         }
     }
     void SetBounceTarget( GameObject go ) {
         moveToward = go;  
     }
 }

Thank you