facebook config error

[Jeffe]

Hello, I have a problem with Facebook Connect plugin configuration, when I try to configure, the following error :
Warning : Can not modify header information - headers already sent by (output Started at /home/brailape/public_html/anunt-simplu.ro/oc-includes/osclass/utils.php:1697 ) in / home / brailape / public_html / anunt- simplu.ro/oc-includes/osclass/utils.php on line 1699
3.2.1 Osclass
Thanks, what should I do ?

[Aficionado]

If you have plugins enabled, try to disable them.

Have you changed the core code ?

Any whitespace maybe (fix it: phptags  --whitespace  *.php)