为什么我安装好wordpress后，登录管理后台出现这样的提示错误 Warning: Invalid argument supplied for foreach() in D:\YToneoffice\webroot\mysnglife\wp-includes\capabilities.php on line 31 Warning: Cannot modify header information - headers already sent by (output started at D:\YToneoffice\webroot\mysnglife\wp-includes\capabilities.php:31) in D:\YToneoffice\webroot\mysnglife\wp-includes\pluggable.php on line 313 Warning: Cannot modify header information - headers already sent by (output started at D:\YToneoffice\webroot\mysnglife\wp-includes\capabilities.php:31) in D:\YToneoffice\webroot\mysnglife\wp-includes\pluggable.php on line 314 Warning: Cannot modify header information - headers already sent by (output started at D:\YToneoffice\webroot\mysnglife\wp-includes\capabilities.php:31) in D:\YToneoffice\webroot\mysnglife\wp-includes\pluggable.php on line 275