I remember something about certain scenario names that have this error, it could be that situation, I have not run into it since I do not put spaces in the scenario names.

The Problem is i didnt code anything! I just used the example scenarios from Greenfoot: You should be able to find the used code when you open yourGreenfootpath\scenarios\balloons. @lordhershey: Yes i already found this bug in other forums. But firstly it's fixed and secondly i dont have anything else then small letters as my projects name. Greetings Painter PS: maybe that helps: http://s1.directupload.net/images/140624/vog7cex4.png

Painter -- I think if you click "Details" then it will show you the full exception. As I say, without the full exception stack trace, we can't help.

Sadly it doesnt, when i click on Details it just opens the following window: http://s1.directupload.net/images/140625/hn2qgwst.png But there are a few commands to print some stuff. Here are some parts of theese: Threadlist: "SysExecutionThead" #166 daemon prio=5 os_prio=0 tid=0x0798a000 nid=0x3028 runnable java.lang.Thread.State: RUNNABLE "TimerQueue" #152 daemon prio=4 os_pri ... Threadstack: Full thread dump Java HotSpot(TM) Client VM (25.5-b02 mixed mode): "TimerQueue" #152 daemon prio=4 os_prio=-1 tid=0x0798c400 nid=0x2c18 waiting on condition java.lang.Thread.State: ... System- und Deployment: __applet_launched = 423911051048 __jvm_launched = 423911167588 acl.read = + acl.read.default = acl.write = + ... Maybe that helps somehow....

Painter21, can you tell us which Java version you have installed? Also, perhaps you could bundle up your exported scenario in a zip and post it somewhere. Then someone else can try it.

@danpost: Threadliste ausgeben... Group main,ac=20,agc=2,pri=10 main,5,alive traceMsgQueueThread,5,alive,daemon Timer-0,5,alive Java Plug-In Pipe Worker Thread (Client-Side),5,alive,daemon SysExecutionTheadCreator,5,alive,daemon MemoryCache-DelayedCleanup,5,alive,daemon CacheMemoryCleanUpThread,5,alive,daemon CacheCleanUpThread,5,alive,daemon Browser Side Object Cleanup Thread,5,alive JVM-Heartbeat,5,alive,daemon AWT-EventQueue-0,6,alive Group Plugin Thread Group,ac=3,agc=0,pri=10 TimerQueue,5,alive,daemon Image Fetcher 0,8,alive,daemon AWT-EventQueue-1,6,alive Group file:/C:/Users/Paule/Desktop/Szenario.html/-threadGroup,ac=6,agc=0,pri=4 Applet 2 LiveConnect Worker Thread,4,alive AWT-EventQueue-3,4,alive Image Fetcher 0,4,alive,daemon Image Fetcher 1,4,alive,daemon TimerQueue,4,alive,daemon ConsoleTraceListener,4,alive,daemon Fertig. @davmac http://www.filedropper.com/szenario

Ok, thanks. When I run it locally I get a dialog saying "Application Blocked by Security Settings" with "Your security settings have blocked a local application from running". You mentioned that you tried to upload it to a server and run it from there. Is that public? What is the URL?

In any case, I uploaded your scenario to a server, here. It runs fine there. More recent Java versions don't allow running applets from 'local' domains (file:/// urls). I think that's probably the issue you're seeing. You need to upload your scenarios somewhere to run them, or export them as standalone applications rather than as webpages.

The security Problem can be fixed in your "Configure Java" - ... App?, sry im not that great in english. However the NullPointer-Problem is fixed now. Thanks for all who helped. Greetings Painter