Maybe your school has a proxy/firewall which prevents UserData class from working.
Well, how should a firewall be set?
What I meant was, your school's network might block the necessary network traffic; in that case, there's not really anything you can do about it, sorry.
I am talking with my teacher about it, my teacher could change it i think
if you would told what to change
It needs to talk to the greenfoot.org server on port 8888.
ok thx. I think our school supports in a few days the userdata