Character not moving on slopes

hey peoples, i am using unity standard asset AI Character Control asset but i am facing some problems with that. Basically the problem is when i am trying my character to move on the slopes it just ignore that and passes the collider even without getting stoped. the codes i am using are listed below :

 private void FixedUpdate()
         {
 
 
             if (target != null)
             {
                 if (current_pos_id < target.Count)
                 {
                     agent.SetDestination(target[current_pos_id].position);
                     
                 }
                 else
                     character.Move(Vector3.zero, false, false);
             }
 
             if (agent.remainingDistance > agent.stoppingDistance)
             {
                 character.Move(agent.desiredVelocity, false, false);
 
 
             }
             else
             {
                 if(character.transform.position.y != target[current_pos_id].position.y)
                 {
                     character.transform.position = new Vector3(character.transform.position.x, target[current_pos_id].position.y, character.transform.position.z);
                 }
                 Debug.Log("character " +character.transform.position);
                 Debug.Log("ideal "+target[current_pos_id].position);
                 current_pos_id++;
                 
             }
         }

can anyone help to solve this problem Thankyou