Template error??

[Kidzukai]

Well, after moving hosts twice more I finally got SMF running (yay!!!!). Only problem is now it looks a little boring...

So I tried to install a new theme. I got the directory right I think, but it gives me:

2: umask() has been disabled for security reasons
File: /hosted/subs/ulmb.com/a/o/aosendatsu/public_html/forum/Sources/Themes.php
Line: 717

What's all that about?