Question Problems with RSS

I can't see RSS!!
This problem is visualized!
Errore interpretazione XML: la dichiarazione XML o testuale non è all'inizio di un'entità
Indirizzo: www.samples-share.com/it/forum/rss
Linea numero 1, colonna 5: <?xml version="1.0" encoding="UTF-8"?>
----^

and there the kunena configuration. i need to solve the problem.
I'm using CB 1.3.1, Kunena 1.6.1

Database collation check: The collation of your table fields are correct

Legacy mode: Disabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 180 seconds | Max execution memory: 64M | Max file upload: 64M

Joomla default template details : yoo_phoenix | author: YOOtheme | version: 1.5.20 | creationdate: January 2010

Kunena version detailled: Installed version: 1.6.1 | Build: 3858 | Version name: Timu | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Samples Share
board_offline	0
board_ofset	0.00
offline_message	<h2>FORUM CLOSED</h2> <div>Stiamo aggiornando il forum. Riaprirà non appena possibile. Nuove funzioni in arrivo!</div>
enablerss	1
enablepdf	1
threads_per_page	30
messages_per_page	20
messages_per_page_search	15
showhistory	1
historylimit	10
shownew	1
jmambot	1
disemoticons	0
template	default
showannouncement	1
avataroncat	1
catimagepath	category_images/
showchildcaticon	1
annmodid	62
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	1
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
changename	0
pubwrite	0
floodprotection	5
mailmod	1
mailadmin	0
captcha	0
mailfull	1
allowavatar	1
allowavatarupload	1
allowavatargallery	1
avatarquality	65
avatarsize	2048
allowimageupload	0
allowimageregupload	1
imageheight	1280
imagewidth	1280
imagesize	500
allowfileupload	0
allowfileregupload	1
filetypes	zip,txt,doc,gz,tgz,mp3,waw,rar,mid,flp,fxp,fxb,wma,ogg,aiff,nki,sf2,fst,osm
filesize	20971520
showranking	1
rankimages	1
avatar_src	fb
fb_profile	fb
pm_component	no
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_username	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_usertype	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	0
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	10
showpopsubjectstats	1
popsubjectcount	5
usernamechange	1
rules_infb	1
rules_cid	296
help_infb	1
help_cid	0
showspoilertag	1
showvideotag	1
showebaytag	0
trimlongurls	0
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	it-it
fbsessiontimeout	1800
highlightcode	0
rss_type	post
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
fbdefaultpage	recent
default_sort	asc
alphauserpointsnumchars	30
sef	1
sefcats	1
sefutf8	0
showimgforguest	0
showfileforguest	0
pollnboptions	15
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	ago
post_dateformat_hover	ago
hide_ip	1
js_actstr_integration	0
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
integration_access	auto
integration_login	communitybuilder
integration_avatar	communitybuilder
integration_profile	communitybuilder
integration_private	uddeim
integration_activity	alphauserpoints
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
onlineusers	1
debug	0
catsautosubscribed	0
showbannedreason	1
version_check	1
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
activity_limit	0

Third-party components: AlphaUserPoints: Installed (Version : 1.5.12) | CommunityBuilder: Installed (Version : 1.3.1) | Jomsocial: Disabled or not installed | UddeIm: Installed (Version : 2.0)

Plugins: System - Mootools12: Disabled | System - Mootools Upgrade: Enabled | JFirePHP: Disabled or not installed | Kunena Discuss: Disabled or not installed | Kunena Search: Disabled or not installed | My Kunena Forum Menu: Disabled or not installed | My Kunena Forum Posts: Disabled or not installed

Modules: Kunena Latest: Enabled (Version : 1.6.0-RC2) | Kunena Stats: Enabled (Version : 1.6.0-RC2) | Kunena Login: Disabled or not installed

Hello,

1°) You should have a joomla! plugin which introduce some blank space, so try do disable all joomla! plugins and re-enable them one by one by testing each time if the rss works
2°) In the kunena configuration panel, set joomla plugin support on disabled

There was a CB plugin who generate the problem. Tank Xillibit