Question Error undefined property

Recently after installation of version 4.010 and language Dutch the forummembers, when making a reply, are getting the following message.
I have posted this in the Dutch forum, but got no answer as yet.

Notice: Undefined property: KunenaViewTopic::$title in /public/sites/www.aldfaerforum.nl/components/com_kunena/template/blue_eagle/html/topic/edit.php on line 44

please help.

Database collation check: The collation of your table fields are

correct

Joomla! SEF: Enabled | Joomla! SEF

rewrite: Enabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Exists | PHP environment:

Max execution time: 30 seconds | Max execution memory: 128M |

Max file upload: 32M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
130	Forum & registreren	kunenamenu	view=home&defaultmenu=131	forum	No
131	Index	kunenamenu	view=category&layout=list&catid=0	forum/index	No
132	Recente onderwerpen	kunenamenu	view=topics&mode=replies	forum/recent	No
134	Geen antwoorden	kunenamenu	view=topics&mode=noreplies	forum/geen-antwoorden	No
133	Nieuw onderwerp	kunenamenu	view=topic&layout=create	forum/nieuw-onderwerp	No
135	Mijn onderwerpen	kunenamenu	view=topics&layout=user&mode=default	forum/mijn-laatste	No
136	Profiel	kunenamenu	view=user	forum/profiel	No
138	Zoeken	kunenamenu	view=search	forum/zoeken	No
146	Donaties	kunenamenu	view=misc	forum/donaties	No
137	Help	kunenamenu	view=misc	forum/help	No

Joomla default template details : atomic_aldfaer | author:

Ron Severdia | version: 2.5.0 | creationdate: 10/10/09

Kunena default template details : Blue Eagle |

author: Kunena Team | version: 4.0.10 | creationdate:

2016-02-18

Kunena version detailed: Kunena 4.0.10 |

2016-02-18 [ Villavicencio ]
| Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	12
messages_per_page_search	15
showhistory	1
historylimit	12
shownew	1
disemoticons	0
template	blue_eagle
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	550
rteheight	10
enableforumjump	0
reportmsg	1
username	0
askemail	1
showemail	1
showuserstats	1
showkarma	0
useredit	1
useredittime	900
useredittimegrace	900
editmarkup	1
allowsubscriptions	1
subscriptionschecked	0
allowfavorites	0
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	0
avatarquality	75
avatarsize	100
imageheight	600
imagewidth	600
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2,doc,docx,asj,asjl
filesize	240
showranking	1
rankimages	1
userlist_rows	20
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	0
userlist_userhits	0
latestcategory
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
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	post
rss_timelimit	year
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	0
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	0
showfileforguest	0
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	datetime
post_dateformat_hover	ago
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	15
thumbwidth	15
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	0
debug	0
catsautosubscribed	0
showbannedreason	0
showthankyou	1
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	text
listcat_show_moderators	0
lightbox	0
show_list_time	0
show_session_type	1
show_session_starttime	0
userlist_allowed	1
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	1
keywords	0
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	0
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	1
pickup_category	1
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	120
iptracking	1
rss_feedburner_url
autolink	1
access_component	0
statslink_allowed	1
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	1
searchtime	365
teaser	0
ebay_language	0
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	1
max_links	6
userlist_name	1
usernamechange	1
version_check	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Enabled: access=1 login=1 activity=1

avatar=1 profile=1 private=1
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (en-GB)
nl-NL	Dutch (NL)

Third-party components: None

Third-party SEF components: None

Plugins:

None

Modules: None

I think it has a missing file.

1) Make backup
2) uninstall kunena (not by tools, but by joomla extension - manage)
3) Install kunena again.

Made a mistake by deinstalling Kunena since it changed the Kunena menu which I had.
So I have restored the back-up and will make various notes about the menu set-up.

If , like you said there is a file missing, wouldn't an installation over the existing one repair the situation?

yeah, it should, but if a file or directory has the wrong permission, then the file is still broken.

Finally, by deinstalling thru Joomla manage and subsequently reinstalling again the system works as usual. First time I forgot certain settings so I installed the back-up.

Now it's fine.

Thank you.

Regretfully some Kunena submenu's containing text are lost.

At the same time the Kunena submenu 'No reply's ' for moderators denies access since I (superuser) appears to have no rights to acces this page.

Do I miss a setting??