APNG problem

file:/home/josh/Desktop/Metroid%20Prime%20GM.egm
Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:604)
	at java.util.ArrayList.get(ArrayList.java:382)
	at org.enigma.file.ApngIO.imagesToApng(ApngIO.java:433)
	at org.enigma.file.EFileWriter$SpriteApngWriter.writeData(EFileWriter.java:401)
	at org.enigma.file.EFileWriter$DataResourceWriter.write(EFileWriter.java:237)
	at org.enigma.file.EFileWriter.writeResource(EFileWriter.java:383)
	at org.enigma.file.EFileWriter.writeNodeChildren(EFileWriter.java:356)
	at org.enigma.file.EFileWriter.writeNodeChildren(EFileWriter.java:365)
	at org.enigma.file.EFileWriter.writeEgmFile(EFileWriter.java:332)
	at org.enigma.file.EFileWriter.writeEgmZipFile(EFileWriter.java:320)
	at org.enigma.file.EgmIO.write(EgmIO.java:74)
	at org.lateralgm.main.FileChooser.save(FileChooser.java:639)
	at org.lateralgm.main.FileChooser.save(FileChooser.java:620)
	at org.lateralgm.main.FileChooser.saveNewFile(FileChooser.java:581)
	at org.lateralgm.main.Listener.actionPerformed(Listener.java:229)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.menuDragMouseReleased(BasicMenuItemUI.java:943)
	at javax.swing.JMenuItem.fireMenuDragMouseReleased(JMenuItem.java:585)
	at javax.swing.JMenuItem.processMenuDragMouseEvent(JMenuItem.java:482)
	at javax.swing.JMenuItem.processMouseEvent(JMenuItem.java:428)
	at javax.swing.MenuSelectionManager.processMouseEvent(MenuSelectionManager.java:321)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:879)
	at java.awt.Component.processMouseEvent(Component.java:6505)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
	at java.awt.Component.processEvent(Component.java:6270)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4861)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:688)
	at java.awt.EventQueue$3.run(EventQueue.java:686)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:702)
	at java.awt.EventQueue$4.run(EventQueue.java:700)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)