在自家電腦安裝沒問題，虛擬主機卻出現這問題！

Warning: ini_set(): Unable to access in /httpdocs/sites/default/settings.php on line 137

Warning: Cannot modify header information - headers already sent by (output started at /httpdocs/sites/default/settings.php:137) in /httpdocs/includes/install.inc on line 573

直接執行 install.php 出現下面錯誤

Warning: ini_set(): Unable to access in /httpdocs/sites/default/settings.php on line 137

Warning: Cannot modify header information - headers already sent by (output started at httpdocs/sites/default/settings.php:137) in /httpdocs/includes/bootstrap.inc on line 531

Warning: Cannot modify header information - headers already sent by (output started at /httpdocs/sites/default/settings.php:137) in /httpdocs/includes/bootstrap.inc on line 532

Warning: Cannot modify header information - headers already sent by (output started at /httpdocs/sites/default/settings.php:137) in /httpdocs/includes/bootstrap.inc on line 533

Warning: Cannot modify header information - headers already sent by (output started at /httpdocs/sites/default/settings.php:137) in /httpdocs/includes/bootstrap.inc on line 534

Warning: Cannot modify header information - headers already sent by (output started at /httpdocs/sites/default/settings.php:137) in /httpdocs/includes/install.inc on line 573