Cannot modify header information - headers already sent by...?

[eluser]Developer13[/eluser]
@Vega - Although you've hit a valid point that will ultimately provide a superficial solution to the problem of whitespace after the closing tag, and although it's "recommended practice", the omission of closing tags (even in PHP-only files) just doesn't seem like a proper solution. To me, it's kind of like turning error reporting off on warnings and notices to not be bothered with non-fatal issues an application might have just to be able to continue with bad programming practices.