Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd5/720/3213720/public_html/flatheme.net/demo/chosen/pratice.php:1) in /storage/ssd5/720/3213720/public_html/flatheme.net/demo/chosen/pratice.php on line 22
Add following code to your .htaccess file
php_flag output_buffering On