title: Unity C#; What's the reason of Resources.load(PNG file path) always return null?
body: <p>I want to change the image that clicked image button.
  so, I set a button and try to load a PNG file at assets/Resources/ PATH.
  But it always return and it makes me massed up -_-.
  Some of questions likes my situation, everybody answers 'try to move file to load assets/Resoucres PATH and my situation couldn't be fixed that way. </p>
  
  <p>Here is my code. This function is load a NumCard_1.png file when clicked a image button. NumCard_1.png exists at assets/Resources folder.</p>
  
  <pre><code>void OnclkMe()
  {
      Sprite newSprite = Resources.Load&lt;Sprite&gt;("/NumCard_1") as Sprite;
      // I already try ("NumCard_1") instead above.
      if(newSprite==null)
      {
          Debug.Log("NULL");    // Always prints "NULL" -_-.
      }
      else
      {
          Debug.Log(newSprite.name);
      }
  }
  </code></pre>