Can't play music anymore from threads

[Karkki]

When I click on a music link in any thread I get an almost blank page in my browser. There's only this text:
"Fatal error: Call to undefined function: can_administer() in /home/vhfansco/public_html/forums/attachment.php on line 30"
Yesterday all worked fine. Should I worry?

I tried all three browsers I have installed: Firefox, Opera ja IE.

[Rid]

Same deal here...

[Karkki]

It works again, thanks Eric!