Сообщение об ошибке

• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) in drupal_send_headers() (line 1490 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) in drupal_send_headers() (line 1490 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) in drupal_send_headers() (line 1490 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• User warning: The following module is missing from the file system: ajax_poll. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• User warning: The following module is missing from the file system: poll_blocks. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• User warning: The following module is missing from the file system: special_module. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• User warning: The following module is missing from the file system: switchtheme. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) в функции drupal_send_headers() (строка 1490 в файле /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) в функции drupal_send_headers() (строка 1490 в файле /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/j/j926608m/26dsp.ru/public_html/index.php:4) в функции drupal_send_headers() (строка 1490 в файле /home/j/j926608m/26dsp.ru/public_html/includes/bootstrap.inc).