Cannot modify header information – headers already sent by

Even though this is usually caused by unwanted spaces or blank lines in the file first mentioned (functions.php:1), I have seen instances where it is caused by plugins. Try disabling all plugins to see if the error goes away.

Also, see this thread for a different solution. The editor used to change the functions.php file inserted invisible characters.

i dont have any pluggins installed on wordpress cause its a brand new install of wordpress, but now i cant even get to the login screen to try and disable anything

cause i get this error

Warning: Cannot modify header information – headers already sent by (output started at /home/content/66/6538766/html/blogs/wp-content/themes/twentyten/functions.php:1) in /home/content/66/6538766/html/blogs/wp-includes/pluggable.php on line 890

How did you edit the wp-config.php file? This can also cause this error. Try creating a new one using notepad, not wordpad. Be sure there are no blank lines at the end.

hey thanks i am guessing… i am getting some place now i have this error:

We were able to connect to the database server (which means your username and password is okay) but not able to select the database_name_here database.

and i check to see if i have permission and i do

If you uploaded a new copy of wp-config.php, did you need to change the database prefix?

/**
 * WordPress Database Table prefix.
 *
 * You can have multiple installations in one database if you give each a unique
 * prefix. Only numbers, letters, and underscores please!
 */
$table_prefix  = 'wp_';

does it have to be certain or do i just type anything in there

a certain number*

It has to exactly match the table names that are in your database. Those tables were created when you installed WordPress. ‘wp_’ may be correct, but I have no way of knowing.

1. i typed the names of the table in wp-config

/**
* WordPress Database Table prefix.
*
* You can have multiple installations in one database if you give each a unique
* prefix. Only numbers, letters, and underscores please!
*/
$table_prefix = ‘wp_commentmeta’;
$table_prefix = ‘wp_comments’;
$table_prefix = ‘wp_links’;
$table_prefix = ‘wp_options’;
$table_prefix = ‘wp_postmeta’;
$table_prefix = ‘wp_posts’;
$table_prefix = ‘wp_terms’;
$table_prefix = ‘wp_terms_relationships’;
$table_prefix = ‘wp_term_taxonomy’;
$table_prefix = ‘wp_usermeta’;
$table_prefix = ‘wp_users’;

2. when i goto the login screen i get this error now

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-login.php on line 337

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-login.php on line 349

3. after i try to login i get this error as well

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-login.php on line 337

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-login.php on line 349

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-includes\pluggable.php on line 690

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-includes\pluggable.php on line 691

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-includes\pluggable.php on line 692

Warning: Cannot modify header information – headers already sent by (output started at C:\xampplite\htdocs\wp-content\themes\twentyten\functions.php:1) in C:\xampplite\htdocs\wp-includes\pluggable.php on line 890

You do not name each table in the wp-config, You only give the prefix for one database. So, if you only have one blog in the database, you would just type (or leave it, because that is the default:

$table_prefix = ‘wp_’;

That prefix would be applied to all tables. Try again without entering all the other lines.

Mac