Question K 1.5.9: Problem with RSS

hello everybody,
I have an amazing problem with kunena RSS
when I click on RSS button,I get an error message :

This page contains the following errors:
error on line 2 at column 1: Document is empty
Below is a rendering of the page up to the first error.

is there anybody help me to remove this problem?

as you can see ,there is a blank line in code (line 1),is this problem?

Hello,

Why do you have posted it in modules ? Is this related with modules ?

Look the source code of the page and tell me what you see at the top.

I think this case is going to require a visit to the user's website. Maybe our questions can be answered there.

What version of Kunena is being run?
What Kunena template is being used?
What version Joomla?
What is the URL of the website?
What is the URL of the Kunena RSS feed?
Is the Kunena forum restricted, or does the public have access?

... and those questions are just for starters.

I just test RSS link with an online validator
my joomla is the last one 1.15
kunena 1.5.9
and I have also :
JSEF ,Virtuemart,RSS factory,SOBI and some other plugins.
my template is default(but I change it as I like)
here is the link: irank.ir/انجمن-ها/fb_rss

I am sorry,I searched in forum and in this part was a relative topic,
If it is possible,please change its category.

You need to find the cause of the blank line at the top of the rss feed. Try by disabling one by one plugins and modules to determine which one do that.

sorry,but moduls in KUNENA page or in all pages?

but how should I find modul between too many moduls!?
:S

A number of RSS feed problems existed in K 1.5.9. You should upgrade immediately to K 1.5.11. Thank you.