RasterFormatException? - Java-Gaming.org

I was modifying my spritesheet loading class to use 64x64 sized images from another sheet, and it now throws this error:

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Exception in thread "Thread-3" java.awt.image.RasterFormatException: (y + height) is outside of Raster
   at sun.awt.image.ByteInterleavedRaster.createWritableChild(Unknown Source)
   at java.awt.image.BufferedImage.getSubimage(Unknown Source)
   at com.natekramber.gfx.SpriteSheet.<init>(SpriteSheet.java:47)
   at com.natekramber.gfx.Screen.<init>(Screen.java:20)
   at com.natekramber.Menu.<init>(Menu.java:16)
   at com.natekramber.Game.init(Game.java:44)
   at com.natekramber.Game.run(Game.java:55)
   at java.lang.Thread.run(Unknown Source)

Here's the spritesheet source:

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package com.natekramber.gfx;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;

public class SpriteSheet {
   final int width16 = 16, height16 = 16, width64 = 64, height64 = 64
         ;
   public final int rows16 = 10, cols16 = 10, rows64 = 4, cols64 = 10
         ;
   public BufferedImage sheet16, sheet64
      ;
   public BufferedImage[] sprites16, sprites64;
   
   public SpriteSheet() {
      try {
         sheet16 = ImageIO.read(SpriteSheet.class.getClassLoader().getResourceAsStream("img/spritesheet16.png"));
      } catch (IOException e) {
         e.printStackTrace();
      }
      
      try {
         sheet64 = ImageIO.read(SpriteSheet.class.getClassLoader().getResourceAsStream("img/spritesheet64.png"));
      } catch (IOException e) {
         e.printStackTrace();
      }
      
      sprites16 = new BufferedImage[rows16 * cols16];
   
      for (int i = 0; i < rows16; i++) {
         for (int j = 0; j < cols16; j++) {
            sprites16[(i * cols16) + j] = sheet16.getSubimage(
                     i * width16 + i * 3,
                     j * height16 + j * 3,
                     width16,
                     height16
                 );
         }
      }
      
      sprites64 = new BufferedImage[rows64 * cols64];
      
      for (int i = 0; i < rows64; i++) {
         for (int j = 0; j < cols64; j++) {
            sprites64[(i * cols64) + j] = sheet64.getSubimage(            //    <--Error is thrown here, line 47
                  i * width64 + i * 3,
                  j * height64 + j * 3,
                  width64,
                  height64
               );
         }
      }
   }
}

Why is it doing this? I have the exact same code for another game, and it doesn't throw any errors. It's even almost the same for the loader above it.

Thanks,
-Nathan