Solved I'm trying to upgrade a old Kunena site get errors

I'm trying to upgrade my old Kunena site, and it's working quite well.
However, when I edit and save a Kunena category, I get the following error: And the other strange thing is, when I log in to the Kunena forum, I get this message:

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: 600 seconds | Max execution memory: 1G | Max file upload: 

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
772	Forum	kunenamenu	view=home&defaultmenu=774	forum	No
773	Index	kunenamenu	view=category&layout=list	forum/index	No
774	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
775	Unread	kunenamenu	view=topics&layout=unread	forum/unread	No
776	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
777	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
778	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
779	Profile	kunenamenu	view=user	forum/profile	No
780	Help	kunenamenu	view=misc	forum/help	No
781	Search	kunenamenu	view=search	forum/search	No
782	Forum	mainmenu	Itemid=772	kunena-2025-08-07	No

Joomla default template details : allrounder | author: Thomas Hunziker | version: 5.0.0 | creationdate: 2023-12-01

Kunena default template details : Aurelia | author: Kunena Team | version: 6.4.4 | creationdate: 2025-07-09

Kunena template params:

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DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
borderless	1
tooltips	1
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avatarPosition	left
formRecover	0
labels	0
whoisonlineName	default
avatarType	rounded
topicicontype	svg
fontawesome	0
optional_username	0
writeaccess	0
localstorage	0
moduleIdWebauthn	0
IconColor	inherit
IconColorNew	#48a348
editorType	ckeditor
Bold	1
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RemoveFormat	1
BulletedList	1
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JustifyBlock	1
Link_Unlink	1
Image	1
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Hidetext	1
Spoiler	1
Code	1
Ebay	0
X_Social	0
Instagram	0
Soundcloud	0
FontSize	1
TextColor	1
Maximize	1
Map	1
Video	1
editorButtons	Ebay,X_Social,Instagram,Soundcloud
nameskinckeditor
ckeditorcustomprefixconfigfile
avatarSizeX	40
avatarSizeY	90
avatarSizeXThumb	36
avatarSizeYThumb	36
avatarSizeXWelcome	72
avatarSizeYWelcome	72
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avatarSizeYList	36
avatarSizeXPost	144
avatarSizeYPost	144
avatarSizeXProfile	200
avatarSizeYProfile	200
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 6.4.4 | 2025-07-09 [ Git Repository ]
        | Kunena detailed configuration:

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Kunena config settings:
boardOffline	0
enableRss	1
threadsPerPage	20
messagesPerPage	6
messagesPerPageSearch	15
showHistory	1
historyLimit	6
showNew	1
disableEmoticons	0
template	aurelia
showAnnouncement	1
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rteWidth	450
rteHeight	300
enableForumJump	1
reportMsg	1
username	0
askEmail	0
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showUserStats	1
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userEdit	1
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userEditTimeGrace	600
editMarkup	1
allowSubscriptions	1
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allowFavorites	1
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regOnly	0
pubWrite	0
floodProtection	0
mailModerators	0
mailAdministrators	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
userlistRows	30
userlistOnline	1
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userlistPosts	1
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popUserCount	5
showPopSubjectStats	1
popSubjectCount	5
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showVideoTag	1
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trimLongUrls	1
trimLongUrlsFront	40
trimLongUrlsBack	20
autoEmbedYoutube	1
autoEmbedEbay	1
ebayLanguageCode	en-us
sessionTimeOut	1800
highlightCode	0
rssType	topic
rssTimeLimit	1 month
rssLimit	100
rssIncludedCategories	0
rssExcludedCategories	0
rssSpecification	rss2.0
rssAllowHtml	1
rssAuthorFormat	name
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rssOldTitles	1
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defaultPage	recent
defaultSort	asc
sef	1
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pollNbOptions	4
pollAllowVoteOne	1
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popPollsCount	5
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pollTimeBtVotes	00:15:00
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pollResultsUserslist	1
allowUserEditPoll	0
maxPersonalText	50
orderingSystem	mesid
postDateFormat	ago
postDateFormatHover	datetime
hideIp	1
imageTypes	jpg,jpeg,gif,png,webp,avif
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imageMimeTypes	image/jpeg,image/jpg,image/gif,image/png,image/webp,image/avif
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hideUserProfileInfo	put_empty
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categorySubscriptions	post
topicSubscriptions	every
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imageUpload	registered
fileUpload	registered
topicLayout	flat
timeToCreatePage	1
showImgFilesManageProfile	1
holdNewUsersPosts	0
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attachmentLimit	8
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articleDisplay	intro
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fallbackEnglish	1
cache	1
cacheTime	60
ipTracking	1
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categoryIcons	1
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teaser	0
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avatarTypes	gif,jpeg,jpg,png
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defaultAvatarSmall	s_nophoto.png
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datePickerFormat	mm/dd/yyyy
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mailBodyUserUnBanned
board_title	Cruisin.nl
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messages_per_page	12
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historylimit	6
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showannouncement	1
avataroncat	0
catimagepath	category_images
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rtewidth	450
rteheight	300
enableforumjump	1
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editmarkup	1
allowsubscriptions	1
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pubwrite	1
floodprotection	0
mailmod	0
mailadmin	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
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| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - Community Builder Disabled
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=1  
 Kunena - Kunena Enabled:  avatar=1  profile=1  
 Kunena - UddeIm Enabled:  private=1  

| Joomla! detailed language files installed:

Warning: Spoiler!

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

Third-party components: UddeIm 5.6.1

Third-party SEF components: None

Plugins: None

Modules: None

1. What is old? Version?
2. Did you go to Kunena dashboard after upgrading?

It's from Joomla! version Joomla! 3.9.15 Stable [ Amani ] January 27, 2020 3:00 PM GMT
And Kunena Version 5.0.12 Date: 2017-11-24.

---

I first updated Joomla to [the website update was successful]. The current Joomla version is now 3.10.12.
Then I removed Kunena via Joomla Extensions: Manage.
And indeed, I always go to the Kunena dashboard after upgrading.
Only when I upgrade to Joomla 4 and then install Kunena again do I encounter problems.
The next step to Joomla 5 and the latest Kunena version also gives the same errors.

After some searching and restarting, I upgraded Joomla3 to Joomla! 3.10.12 and Kunena to version 5.2.14.
Then it went smoothly.
The upgrade worked, so it's resolved.

Yes, you didn't follow the steps correctly.

An upgrade to K6.1xis only possible from the Kunena versions K5.1 and K5.2

docs.kunena.org/en/basics/upgrade/upgrade-k6-x