What does this warning mean?

[DOKA]

Warning: array_sum() [function.array-sum]: The argument should be an array in [path]/global.php(607) : eval()'d code on line 5

This was at the top of my screen when I logged in.

 

[ElDiabloConCaca]

Logged into what? Your computer? This forum? Another website?

That's a php function, and php is a server-side scripting language primarily used for the web. If you received that error on a web page, there's nothing you can do about it -- nor did you or your browser cause it. It's something that happened on the computer that's serving the web page, and is 100% out of your control.

If you saw that message somewhere else (outside of a browser), please elaborate on when and where and under what circumstances you saw it.