When i open my scenario it gives me this error and i can run it but i can't edit any of the classes.
the error:
java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(ArrayList.java:371) at java.util.ArrayList.get(ArrayList.java:384) at com.sun.imageio.plugins.jpeg.JPEGImageReader.checkTablesOnly(JPEGImageReader.java:326) at com.sun.imageio.plugins.jpeg.JPEGImageReader.gotoImage(JPEGImageReader.java:427) at com.sun.imageio.plugins.jpeg.JPEGImageReader.readHeader(JPEGImageReader.java:543) at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:986) at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:966) at javax.imageio.ImageIO.read(ImageIO.java:1448) at javax.imageio.ImageIO.read(ImageIO.java:1400) at greenfoot.util.GraphicsUtilities.loadCompatibleTranslucentImage(GraphicsUtilities.java:224) at greenfoot.GreenfootImage.loadURL(GreenfootImage.java:268) at greenfoot.GreenfootImage.loadFile(GreenfootImage.java:295) at greenfoot.GreenfootImage.<init>(GreenfootImage.java:109) at greenfoot.util.GreenfootUtil.getGreenfootImage(GreenfootUtil.java:797) at greenfoot.core.ProjectProperties.getImage(ProjectProperties.java:269) at greenfoot.gui.classbrowser.role.ImageClassRole.getClassThatHasImage(ImageClassRole.java:98) at greenfoot.gui.classbrowser.role.ImageClassRole.getGreenfootImage(ImageClassRole.java:109) at greenfoot.gui.classbrowser.role.ImageClassRole.getImage(ImageClassRole.java:80) at greenfoot.gui.classbrowser.role.ImageClassRole.changeImage(ImageClassRole.java:156) at greenfoot.gui.classbrowser.role.ImageClassRole.buildUI(ImageClassRole.java:63) at greenfoot.gui.classbrowser.ClassView.update(ClassView.java:188) at greenfoot.gui.classbrowser.ClassView.init(ClassView.java:143) at greenfoot.gui.classbrowser.ClassView.<init>(ClassView.java:73) at greenfoot.gui.GreenfootFrame.populateClassBrowser(GreenfootFrame.java:608) at greenfoot.gui.GreenfootFrame.openProject(GreenfootFrame.java:326) at greenfoot.core.GreenfootMain$2.run(GreenfootMain.java:211) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:682) at java.awt.EventQueue$3.run(EventQueue.java:680) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:691) 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)
