Buffer flushing issue

["Cafe Perl Account" <suppressed>]

Hi all. 

I'm trying to use $r->rlfush to flush the output on my CGI scripts, but some times i get the folowing error:

"$r->rflush can't be called before the response phase at /html/perl/test.pl line 10"

And worst: when this error happens, the script gets uploaded to the browser.

Can anyone help? 

Regards,
Cafe.

Ps: Sorry for the poor english.