Website Login Warnings

I haven’t touched one of my websites in a couple of months, but when I tried to login today, the website gave me these errors:

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-login.php on line 431

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-login.php on line 444

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-content/plugins/wpclef/includes/lib/wp-session/class-wp-session.php on line 124

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-includes/pluggable.php on line 935

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-includes/pluggable.php on line 936

Warning: Cannot modify header information – headers already sent by (output started at /home/tpcfbr/public_html/wp-settings.php:1) in /home/tpcfbr/public_html/wp-includes/pluggable.php on line 937

Does anyone have any ideas what would cause this? I’ve typed the code up to show what is on those specific lines.

Lines 425-446:

// 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();

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.
$secure = ( 'https' === parse_url( site_url(), PHP_URL_SCHEME ) && 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
setcookie( TEST_COOKIE, 'WP Cookie check', 0, COOKIEPATH, COOKIE_DOMAIN, $secure );
if ( SITECOOKIEPATH != COOKIEPATH )
	setcookie( TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN, $secure );

Lines 120-125:

/**
     * Set the session cookie
     */
    protected function set_cookie() {
        setcookie( WP_SESSION_COOKIE, $this->session_id . '||' . $this->expires . '||' . $this->exp_variant , $this->expires, COOKIEPATH, COOKIE_DOMAIN );
    }

Lines 921-943:

/**
	 * Fires immediately before the secure authentication cookie is set.
	 *
	 * @since 2.6.0
	 *
	 * @param string $logged_in_cookie The logged-in cookie.
	 * @param int    $expire           Login grace period in seconds. Default 43,200 seconds, or 12 hours.
	 * @param int    $expiration       Duration in seconds the authentication cookie should be valid.
	 *                                 Default 1,209,600 seconds, or 14 days.
	 * @param int    $user_id          User ID.
	 * @param string $scheme           Authentication scheme. Default 'logged_in'.
	 */
	do_action( 'set_logged_in_cookie', $logged_in_cookie, $expire, $expiration, $user_id, 'logged_in' );

	setcookie($auth_cookie_name, $auth_cookie, $expire, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
	setcookie($auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
	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);
}
endif;

if ( !function_exists('wp_clear_auth_cookie') ) :