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

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