修复wordpress安装buddypress插件后的警告

周末有空下了wordpress和buddypress，安装并激活buddypress后，出现一长串警告

( ! ) Warning: Creating default object from empty value in \wordpress\wp-content\plugins\buddypress\bp-loader.php on line 71
Call Stack
# Time Memory Function Location
1 0.0013 140680 {main}( ) ..\index.php:0
2 0.0021 142808 require( '\wordpress\wp-blog-header.php' ) ..\index.php:17
3 0.0031 152936 require_once( '\wordpress\wp-load.php' ) ..\wp-blog-header.php:12
4 0.0046 160336 require_once( '\wordpress\wp-config.php' ) ..\wp-load.php:29
5 0.0074 217240 require_once( '\wordpress\wp-settings.php' ) ..\wp-config.php:906 0.4971 8465680 include_once( '\wordpress\wp-content\plugins\buddypress\bp-loader.php' ) ..\wp-settings.php:198

这个错误一般是php的版本不同造成的，使用php5.3后就没有这个问题了