Now i install WordPress then BuddyPress, after the install buddypress i run the site, home page was run, when click the other page link the page was not working. show this error

Not Found

The requested URL /Repo/website/groups/ was not found on this server. Apache/2.2.17 (Ubuntu) Server at localhost Port 80

After then i check my local htaccess, here is all are ok, but why the problem is showing. Here is my local htaccess ..

<Directory />
    Options FollowSymLinks
    AllowOverride all
</Directory>
<Directory /var/www/>
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
    Order allow,deny
    allow from all
</Directory>

ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
    AllowOverride None
    Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
    Order allow,deny
    Allow from all
</Directory>