Remove twitter tools, then see if the problem exists..
I deleted three unused plugins, no change, it was never specifically to do with Twitter Tools, the error occurs when I add new posts, when I click the ‘more’ tag on the post creator, when I post comments. Virtually any action causes it.
Disable all plugins, and switch to the default theme..
If your installation then functions you know it’s one of two things, either a plugin or the theme, then start enabling one thing at a time until the problem is re-produced..
Also check your config file (wp-config.php) and make sure there’s no extra spaces on the end, after the ending ?>
I should have probably added that I’m new to wordpress and attempting to build a theme.
Its definitely the theme that is at fault. With other themes active it’s fine, and when I empty the functions.php file its fine.
I’ve tried replacing the functions.php file with one from the classic and the default theme and it still doesn’t work :/.
Perhaps I’m writing a functions.php file wrongly? I can’t seem to find any guides as to how they should be written though.
Oh and I checked the wp-config file and there isn’t an ending ?> I unzipped the 2.8.2 WordPress download and the sample doesn’t have an end tag either.
It tells you the error
C:\xampp\htdocs\wordpress\wp-content\themes\clinical\functions.php:1
There’s probably a blank line at the start of that file. Which editor are you looking at it in?
There’s not meant to be a closing ?> at the end of wp-config.
Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\wordpress\wp-content\themes\clinical\functions.php:1) in <b>C:\xampp\htdocs\wordpress\wp-content\plugins\twitter-tools\twitter-tools.php</b> on line <b>1106</b><br />
Its definitely the theme that is at fault.
just like described in the faq 🙂
DONT use a plain text editor, dont introduce spaces or other ‘stuff’ before the opening <?php
thats precisely what that error suggests is happening.
I’m using Notepad++, I may be new to WordPress but not XHTML/CSS etc.
With the show all characters option selected in Notepad++
http://www.ispycreativity.com/uploads/wordpress-errors/wordpress-functions-php-show-all-chars.jpg
The below images should (hopefully demonstrate that there are no extra characters.
http://www.ispycreativity.com/uploads/wordpress-errors/wordpress-functions-php-top.JPG
http://www.ispycreativity.com/uploads/wordpress-errors/wordpress-functions-php-bottom.JPG
and the functions.php file, saved as phps (I’ve never used this format before).
http://www.ispycreativity.com/uploads/wordpress-errors/functions.phps
If someone manages to resolve this for me I’ll be eternally indebted to them.
Hmm, when the functions.php file is completely empty no errors occur, however when I add just
<?php ?>
the error occurs.
I’ve just started a new theme and I’m still getting the same error even though I swear to god I’m doing it perfectly.
I’m using the latest wordpress version on a local xampp install.
The error I’m getting is:
Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\wordpress\wp-content\themes\naturally-dark\functions.php:1) in C:\xampp\htdocs\wordpress\wp-includes\pluggable.php on line 865
Could it be something to do with the fact it says C:\xampp\htdocs\ as opposed to http://localhost/?
2 months later I finally found the solution. Thanks to: http://stackoverflow.com/questions/1067742/clean-source-code-files-of-invisible-characters
The character was a Byte Order Mark “a Microsoft invention to tell, in a Unicode file, in which order multi-byte characters are stored.
To get rid of it, tell your editor to save the file either as ANSI/ISO-8859 or as Unicode without BOM”.
To do this in Notepad++ go Format > Convert to UTF-8 without BOM then Format > Encode in UTF-8 without BOM.
Blue Stunt; thank you for posting your solution to the problem
I downloaded Notepad++ and my problems were totally solved!
Thank you!
Thanks a lot for posting the solution, I just got the same issue after I did a quick fix to a file using notepad…. I’ll never do that again ! 🙂
— Woods
