Sprite not animated

Hello!

I have tested AgateLib, but have some problems animating sprites. I don't know if I'm doing bad something, but my sprite is displayed without animation.

The image named "player_stand.png" is an image with all frames inside.

Here is the code.

public static void Main (string[] args)
{
using (AgateSetup setup=new AgateSetup())
{
setup.InitializeAll();

if (setup.WasCanceled)
return;

DisplayWindow display=DisplayWindow.CreateWindowed("Hime no Chikara", 800, 600);
Sprite player1=new Sprite("player_stand.png", 92, 273);
player1.AnimationType=SpriteAnimType.Looping;
player1.IsAnimating=true;

while (!display.IsClosed)
{
Display.BeginFrame();
Display.Clear(Color.White);
player1.Draw(new Rectangle(0, 0, 92, 273));
player1.Update();
player1.AdvanceFrame();

Display.EndFrame();
Core.KeepAlive();

if (Keyboard.Keys[KeyCode.Escape])
{
display.Dispose();
}
}
}
}

The sprite does not animate, always appears a single frame indefinitely. I thought that line player1.AdvanceFrame() was necessary, but it present or not, the result is the same.

What i'm doing bad? Any help will be appreciated.

Thanks!