Is this my computer, or the site?

[theboywarrior]

When I clicked some of the links, particularly to the login page, at the top of the page, it reads, as follows-


[phpBB Debug] PHP Notice: in file /includes/functions.php on line 3760: Cannot modify header information - headers already sent by (output started at /language/en/posting.php:1)
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 3762: Cannot modify header information - headers already sent by (output started at /language/en/posting.php:1)
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 3763: Cannot modify header information - headers already sent by (output started at /language/en/posting.php:1)
[phpBB Debug] PHP Notice: in file /includes/functions.php on line 3764: Cannot modify header information - headers already sent by (output started at /language/en/posting.php:1)


What does this mean? is my Internet too slow? Or is this a problem with the site?
Confused and worried,
Theboywarrior