Question Annoying "Strict Standards" message - please help!

Users are getting this message at the top of their screens:
"Strict Standards: Only variables should be assigned by reference in /home/rhi18899/public_html/plugins/system/joomessLibrary/joomessLibrary.php on line 411"

What does it mean? What should I do to get rid of it?

My configuration follows:

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

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

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 45 seconds | Max execution memory: 128M | Max file upload: 24M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path
222	Chatterbox Cafe	mainmenu	view=category&layout=list&catid=0	future-chatterbox-cafe
228	Recent Conversation Topics	mainmenu	view=topics&mode=replies	future-chatterbox-cafe/recent-conversation-topics
227	My Chatterbox Topics	mainmenu	view=topics&layout=user&mode=default&modetype=	future-chatterbox-cafe/my-chatterbox-topics
226	Create a New Discussion Topic	mainmenu	view=topic&layout=create&catid=	future-chatterbox-cafe/create-a-chatterbox-topic
224	Search the Cafe	mainmenu	view=search	future-chatterbox-cafe/search-the-chatterbox
225	Chatterbox Statistics	mainmenu	view=statistics	future-chatterbox-cafe/chatterbox-statistics
184	Forum	kunenamenu	view=home&defaultmenu=186	kunena
185	Index	kunenamenu	view=category&layout=list	kunena/index
186	Recent Topics	kunenamenu	view=topics&mode=replies	kunena/recent
187	New Topic	kunenamenu	view=topic&layout=create	kunena/newtopic
188	No Replies	kunenamenu	view=topics&mode=noreplies	kunena/noreplies
189	My Topics	kunenamenu	view=topics&layout=user&mode=default	kunena/mylatest
190	Profile	kunenamenu	view=user	kunena/profile
191	Help	kunenamenu	view=misc	kunena/help
192	Search	kunenamenu	view=search	kunena/search

Joomla default template details : beez_20 | author: Angie Radtke | version: 2.5.0 | creationdate: Unknown

Kunena default template details : Blue Eagle 2.0 | author: Kunena Team | version: 3.0.0 | creationdate: 2013-05-15

Kunena version detailed: Kunena 3.0.0 | 2013-05-15 [ Wanga ]
| Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	blue_eagle
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	0
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	1
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	800
imagewidth	800
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	120
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	2,7,18,19
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
usernamechange	0
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
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
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	5
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	datetime
hide_ip	1
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
boxghostmessage	0
userdeletetmessage	1
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
version_check	1
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
keywords	0
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	1
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	8
pickup_category	0
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	1
rss_feedburner_url
autolink	1
access_component	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Enabled: access=0 login=1 activity=1 avatar=1 profile=1 private=0
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=0
Kunena - Kunena Enabled: avatar=0 profile=0
Kunena - UddeIM Enabled: private=1

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)

Third-party components: None

Third-party SEF components: None

Plugins: Content - Kunena Discuss 3.0.0

Modules: Kunena Latest 3.0.0 | Kunena Stats 3.0.0

Hello,

The error message isn't related to Kunena, but you can report to joomess developeprs the issue.

Then you can disable display php errors in Joomla! configuration panel

Thank you for the reply, however,...

I don't know what "Joomess is, and
I can't find where "display php errors" is.

I'll keep looking.

This might help you to understand what is "joomess": jVoteSystem