Looks like you might have the classic "wrong case filename" problem. It doesn't work... are you using wrong case in your filenames? ("xyz.png" instead of "xyz.PNG" for example)

Hello everyone, i am new here and i would like to tell you that greenfoot is a great IDE for game development in Java and it has made my life much easier when it comes to animations. Anyways, i am part of a team called Wylde Arts were we develop games for the web in Java and Flash basically but we also use game editors such as sploder. Greenfoot has really gained my interest as a means for creating good Java games. Currently Wylde Arts http://www.wyldearts.com is still in it's very beginning and we need staff who can write games in Java(preferably using greenfoot) and members to submit their games to the site and we will host the games for them. Any contributors will be welcome,if you would like to be a contributor or staff member please send me a request to my email: ayman_farhat@wyldearts.com. @Zerg, i have checked out your isometric pac man game it seems spectacular, so i would like to invite you to join our team or host your game on our site where you will be given full credit for your work and any links you want to add could be added on your profile and games. So if you are interested please send me an email so that we can talk about the details. This offer is applicable to anyone, thanks for your interest hope to chat with you all, the works here are really impressive :)