fixed. after set the forum url to the default http://…/bbpress/. it works. why ? we can’t change it? or just because I upload bbpress to directory ‘/bbpress/’ ?
and my .htaccess file is :
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
