Using Resources.LoadAll with arrays

I seem to be having problems with loading a folder of images into an array. Here is the related code:

 using UnityEngine;
 using System.Collections;
 
 public class AnimateImageOnPlane : MonoBehaviour
 {
  
  private Object[] frames; 
  private float framesPerSecond = 30.0f;
  private Texture holder;
  
  void Start()
  {
  frames = Resources.LoadAll("Textures/Social", typeof(Texture));
  Debug.Log("Frame Length: " + frames.Length);
  }
  
  void Update () 
  {
  if(frames.Length > 0)
  {
      int index = (int)(Time.time * framesPerSecond);
  
      index = index % frames.Length;
  if(index < frames.Length)
  {
  holder = frames[index] as Texture;
      gameObject.renderer.materials[0].mainTexture = holder;
  }
  }
  }