Cannot modify header information – headers already sent by

Today, dunno why, I just was welcomed with this kind of information, when I tried to log in to my WP (from what I know yesterday I installed Lite Cache + some how I think that it’s good to mention that I’m using Hide My WP also).

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-login.php on line 384

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-login.php on line 396

wp-login.php:

// validate action so as to default to the login screen
if ( !in_array( $action, array( ‘postpass’, ‘logout’, ‘lostpassword’, ‘retrievepassword’, ‘resetpass’, ‘rp’, ‘register’, ‘login’ ), true ) && false === has_filter( ‘login_form_’ . $action ) )
$action = ‘login’;

nocache_headers();

[384] header(‘Content-Type: ‘.get_bloginfo(‘html_type’).’; charset=’.get_bloginfo(‘charset’));

if ( defined( ‘RELOCATE’ ) && RELOCATE ) { // Move flag is set
if ( isset( $_SERVER[‘PATH_INFO’] ) && ($_SERVER[‘PATH_INFO’] != $_SERVER[‘PHP_SELF’]) )
$_SERVER[‘PHP_SELF’] = str_replace( $_SERVER[‘PATH_INFO’], ”, $_SERVER[‘PHP_SELF’] );

$url = dirname( set_url_scheme( ‘https://’ . $_SERVER[‘HTTP_HOST’] . $_SERVER[‘PHP_SELF’] ) );
if ( $url != get_option( ‘siteurl’ ) )
update_option( ‘siteurl’, $url );
}

//Set a cookie now to see if they are supported by the browser.
[396] setcookie(TEST_COOKIE, ‘WP Cookie check’, 0, COOKIEPATH, COOKIE_DOMAIN);
if ( SITECOOKIEPATH != COOKIEPATH )
setcookie(TEST_COOKIE, ‘WP Cookie check’, 0, SITECOOKIEPATH, COOKIE_DOMAIN);

and after I log in I have the same message about wp-login.php +:

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-includes/pluggable.php on line 678

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-includes/pluggable.php on line 679

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-includes/pluggable.php on line 680

Warning: Cannot modify header information – headers already sent by (output started at /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-config.php:1) in /homepages/31/d415355951/htdocs/bartoszandrzejewski.pl/wp-includes/pluggable.php on line 875

so… pluggable.php:

$auth_cookie = wp_generate_auth_cookie($user_id, $expiration, $scheme);
$logged_in_cookie = wp_generate_auth_cookie($user_id, $expiration, ‘logged_in’);

do_action(‘set_auth_cookie’, $auth_cookie, $expire, $expiration, $user_id, $scheme);
do_action(‘set_logged_in_cookie’, $logged_in_cookie, $expire, $expiration, $user_id, ‘logged_in’);

[678] setcookie($auth_cookie_name, $auth_cookie, $expire, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
[679] setcookie($auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
[680] setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, COOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true);
if ( COOKIEPATH != SITECOOKIEPATH )
setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true);

and then a little further:

if ( !$is_IIS && php_sapi_name() != ‘cgi-fcgi’ )
status_header($status); // This causes problems on IIS and some FastCGI setups

[875] header(“Location: $location”, true, $status);
}
endif;

Help me please ??