BuddyPress.org

tnx to my host he found that i i didnt have .htaccess file

and you need to add wp rewrite IfModule . htaccess file

# BEGIN WordPress

<IfModule mod_rewrite.c>

RewriteEngine On

RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]

</IfModule>

# END WordPress

enjoy