Solved You have orphaned or lost categories! Please change their parent to be a valid category

please how can i overcome this in my backend
— ORPHAN : Welcome Mat (Alias: welcome-mat) Public / Nobody (Access: joomla.group) 2

— ORPHAN : Suggestion Box (Alias: suggestion-box) Public / Nobody (Access: joomla.group) 3

it shows this always,
You have orphaned or lost categories! Please change their parent to be a valid category
and on my site it shows

The requested page can't be found.
An error has occurred while processing your request.

You may not be able to visit this page because of:

an out-of-date bookmark/favourite
a mistyped address
a search engine that has an out-of-date listing for this site
you have no access to this page

Search

You may wish to search the site or visit the home page.
www.histopoint.com/index.php/forum

Hello,

Can-you please make a screenshot of the Kunena categories manager ?

that is it

It seems your page is new and without content. If it is so my suggestion: Go in backend to Kunena -> Tools -> Uninstall Kunena. Remove Kunena completely, and remove also all links to the forum in other menus. Then install Kunena again.

i have do it over and over again but all the same

What happens if you to delete the categories and then create new? You use php7 ? Please create a configuration report.
www.kunena.org/docs/en/faq/configuration-report

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: Missing | PHP environment: Max execution time: 30 seconds | Max execution memory: 64M | Max file upload: 5M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
125	Forum	kunenamenu	view=home&defaultmenu=127	forum	No
126	Index	kunenamenu	view=category&layout=list	forum/index	No
127	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
128	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
129	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
130	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
131	Profile	kunenamenu	view=user	forum/profile	No
132	Help	kunenamenu	view=misc	forum/help	No
133	Search	kunenamenu	view=search	forum/search	No
134	Forum	mainmenu	Itemid=125	kunena-2016-05-12	No

Joomla default template details : protostar | author: Kyle Ledbetter | version: 1.0 | creationdate: 4/30/2012

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	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	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
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_posts	1
userlist_karma	1
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
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	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	4
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	0
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
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	2
show_session_starttime	1800
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
keywords	1
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
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

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
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)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None

You can use diagnotics tool by going to : administrator/index.php?option=com_kunena&view=tools&layout=diagnostics


This is the link which displays the same page:

yoursite.com/administrator/index.php?opt...s&layout=diagnostics

then check on this page if you see issues

There is a bug in kunena with PHP7.0.6

Solution until its fixed, is to downgrade php to 5.6 or php 7.0.5

thank you down grade to php 5.6 and is now working proper