Solved Joomla 4 migration KPATH_ADMIN error bricked site.

CB is definitely installed, but since a new update came out a couple of days ago I went ahead and updated it. Hopefully that resolves it showing as not installed. I think during migration something made the system think it wasn't installed despite the fact that CB was fully working on my frontend.

That said, after doing this, re-enabling CB integration still causes the same 500 error.

New configuration report since the changes:

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: 120 seconds | Max execution memory: 128M | Max file upload: 

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
1326	Forum	topmenu	Itemid=1316	kunena-2023-03-11	No
1316	Forum	kunenamenu	view=home&defaultmenu=1317	kunena	No
1317	Index	kunenamenu	view=category&layout=list	kunena/index	No
1318	Recent Topics	kunenamenu	view=topics&mode=replies	kunena/recent	No
1319	Unread	kunenamenu	view=topics&layout=unread	kunena/unread	No
1320	New Topic	kunenamenu	view=topic&layout=create	kunena/newtopic	No
1321	No Replies	kunenamenu	view=topics&mode=noreplies	kunena/noreplies	No
1322	My Topics	kunenamenu	view=topics&layout=user&mode=default	kunena/mylatest	No
1323	Profile	kunenamenu	view=user	kunena/profile	No
1324	Help	kunenamenu	view=misc	kunena/help	No
1325	Search	kunenamenu	view=search	kunena/search	No

Joomla default template details : cassiopeia_nab_network | author: Jared Petersen | version: 1.0 | creationdate: March 2023

Kunena default template details : Aurelia | author: Kunena Team | version: 6.0.9.1 | creationdate: 2023-02-22

Kunena template params:

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DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
borderless	1
tooltips	1
SubjectLengthMessage	80
fullactions	1
quick	0
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayModule	1
displayBreadcrumb	1
displayAnnouncement	1
displayFooter	1
avatarPosition	left
formRecover	0
labels	0
whoisonlineName	default
avatarType	rounded
topicicontype	svg
fontawesome	0
socialshare	0
socialsharetag
socialtheme	classic
optional_username	0
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#48a348
editorType	ckeditor
Bold	1
Italic	1
Underline	1
Strike	1
Subscript	1
Superscript	1
RemoveFormat	1
BulletedList	1
NumberedList	1
Blockquote	1
JustifyLeft	1
JustifyCenter	1
JustifyRight	1
JustifyBlock	1
Link_Unlink	1
Image	1
Smiley	1
Confidential	1
Hidetext	1
Spoiler	1
Code	1
Ebay	1
Twitter	1
Instagram	1
Soundcloud	1
FontSize	1
TextColor	1
Maximize	1
Map	1
Video	1
editorButtons
nameskinckeditor
ckeditorcustomprefixconfigfile
avatarSizeX	40
avatarSizeY	90
avatarSizeXThumb	36
avatarSizeYThumb	36
avatarSizeXWelcome	72
avatarSizeYWelcome	72
avatarSizeXList	36
avatarSizeYList	36
avatarSizeXPost	144
avatarSizeYPost	144
avatarSizeXProfile	200
avatarSizeYProfile	200
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 6.0.9.1 | 2023-02-22 [ 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
avatarOnCategory	0
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
maxSig	300
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
userlistAvatar	1
userlistPosts	1
userlistKarma	1
userlistEmail	0
userlistJoinDate	1
userlistLastVisitDate	1
userlistUserHits	1
latestCategory	0
showStats	0
showWhoIsOnline	0
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
rssType	topic
rssTimeLimit	1 month
rssLimit	100
rssIncludedCategories
rssExcludedCategories
rssSpecification	rss2.0
rssAllowHtml	1
rssAuthorFormat	name
rssAuthorInTitle	1
rssWordCount	0
rssOldTitles	1
rssCache	900
defaultPage	recent
defaultSort	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
allowUserEditPoll	0
maxPersonalText	50
orderingSystem	mesid
postDateFormat	ago
postDateFormatHover	datetime
hideIp	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
userDeleteMessage	0
latestCategoryIn	1
topicIcons	1
debug	0
catsAutoSubscribed	0
showBannedReason	0
showThankYou	1
showPopThankYouStats	1
popThanksCount	5
modSeeDeleted	0
bbcodeImgSecure	text
listCatShowModerators	0
lightbox	1
showListTime	720
showSessionType	2
showSessionStartTime	1800
userlistAllowed	1
userlistCountUsers	1
enableThreadedLayouts	0
categorySubscriptions	post
topicSubscriptions	every
pubProfile	1
thankYouMax	10
emailRecipientCount	0
emailRecipientPrivacy	bcc
captchaPostLimit	0
imageUpload	registered
fileUpload	registered
topicLayout	flat
timeToCreatePage	0
showImgFilesManageProfile	1
holdNewUsersPosts	0
holdGuestPosts	0
attachmentLimit	8
pickupCategory	0
articleDisplay	intro
sendEmails	1
fallbackEnglish	1
cache	1
cacheTime	60
ipTracking	1
rssFeedBurnerUrl
autoLink	1
accessComponent	1
statsLinkAllowed	1
superAdminUserlist	0
attachmentProtection	0
categoryIcons	1
avatarCrop	0
userReport	1
searchTime	365
teaser	0
ebayLanguage	0
ebayCertId
allowChangeSubject	1
maxLinks	6
readOnly	0
ratingEnabled	0
urlSubjectTopic	0
logModeration	0
attachStart	0
attachEnd	14
attachmentUtf8	1
autoEmbedSoundcloud	1
emailHeader	media/kunena/email/hero-wide.png
userStatus	1
signature	1
personal	1
social	1
plainEmail	0
moderatorPermDelete	0
avatarTypes	gif,jpeg,jpg,png
smartLinking	0
defaultAvatar	nophoto.png
defaultAvatarSmall	s_nophoto.png
quickReply	1
avatarEdit	0
activeMenuItem
mainMenuId
homeId
indexId
moderatorsId
topicListId
miscId
profileId
searchId
custom_id
avatarType	1
sefRedirect	1
allowEditPoll	1
useSystemEmails	0
autoEmbedInstagram	1
disableRe	0
email_sender_name	NerfArena.net Forums
display_filename_attachment	0
new_users_prevent_post_url_images	0
minimal_user_posts_add_url_image	10
utmSource	0
emailHeaderSizeY	560
emailHeaderSizeX	560
moderator_id
profiler	0
pickup_category	0
board_title	Nerf ArenaBlast Forum
board_offline	0
offline_message	The Forum is currently offline for maintenance. Check back soon!
enablerss	1
threads_per_page	20
messages_per_page	20
messages_per_page_search	25
showhistory	1
historylimit	6
shownew	1
disemoticons	0
showannouncement	0
avataroncat	0
catimagepath	category_images
showchildcaticon	0
rtewidth	450
rteheight	300
enableforumjump	0
reportmsg	0
askemail	0
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	0
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
mailfull	1
allowavatarupload	0
allowavatargallery	1
avatarquality	100
avatarsize	4000
imageheight	1024
imagewidth	1024
imagesize	2500
filetypes	doc,docx,txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2,nrf,u,utx,uax,t3d,umx,bmp,uc,int,ini,pcx,unr,log,upkg
filesize	3000
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	0
latestcategory	0
showstats	0
showwhoisonline	0
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	0
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	recent
rss_timelimit	year
rss_limit	10
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
showimgforguest	1
showfileforguest	1
pollnboptions	10
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	0
allow_user_edit_poll	0
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	80
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	0
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	0
show_list_time	720
show_session_type	2
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userlist_count_users	2
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	first
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
email_visible_address
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	16
article_display	intro
send_emails	1
fallback_english	1
cache_time	60
ebay_affiliate_id	5337089937
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	2
avatarcrop	0
user_report	0
searchtime	365
ebay_language	0
ebay_api_key
ebay_cert_id
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	0
max_links	6
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
google_map_api_key
attachment_utf8	1
autoembedsoundcloud	1
emailheader
user_status	1
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avatartypes	gif, jpeg, jpg, png
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stopforumspam_key	a2uzpog7nydhqf
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allow_edit_poll	1
use_system_emails	0
autoembedinstagram	1
disable_re	0
recaptcha_publickey
recaptcha_privatekey
recaptcha_theme	white
keywords	0
userkeywords	0

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Enabled:  access=1  login=1  activity=1  avatar=1  profile=1  private=0  
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=0  
 Kunena - Kunena Enabled:  avatar=1  profile=1  

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
cs-CZ	Czech (Čeština)
en-GB	English (United Kingdom)
en-US	English (United States)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: Kunena Latest 6.0.2

The community builder still doesn't appear. It should appear under Third-party components below in the configuration report. Something is wrong. Try the following:
1. Rename the htaccess.txt to .htaccess
2. Check in System -> Extensions -> (search by keyword "comm") if everything from the CB is activated
3. Check if the CB works without Kunena (with disabled integration plugin)
4. If yes, download Kunena and unzip the zip file
5. Uninstall the Kunena CB integration plugin
6. Install this plugin from the extracted zip file (it is the plugin plg_kunena_comprofiler)
7. Test again

I already fixed the htaccess file earlier, but after going through the rest of your steps the same things happens still. Community builder seems to work fine. I can log in and view users and even approve user registrations still.

I just read through www.kunena.org/forum/12-Community-Builde...ntegration-500-error and set my default language away from US English back to GB English and suddenly no 500 error when the cb integration plugin is on. I'm still testing things to make sure. While I understand that Kunena isn't in US English, having your Joomla site be in US English probably shouldn't cause such a horrible defect. That said, it still isn't showing in the config report so if there's any other information I can provide to help with that let me know.

Thank you very much, now that you have brought it to my attention, I know where the problem lies. You can also find the solution in this linked topic. Kunena itself has an option to automatically load the en-GB language for the forum if no translation of the selected language is available. Unfortunately, this does not apply to the plugins or extensions.
Don't worry about the configuration report if everything else is fine.

Cool. I did have Use English On Missing Strings set to on so I guess I didn't think to check this possibility at first. The error certainly didn't help either as it definitely mislead me into thinking this was a larger problem with the migration like many of the other plugins on my site that are still suffering ill effects. Thanks for the support either way.

Do note like I said earlier that this bug can brick the backend and leave you unable to recover it (without some table editing I imagine) if you put the forum into maintenance mode while you have this error. I'm not sure if it will crop up without error reporting to max but I assume it would just error 500 on the backend. That's probably the biggest frustration I suffered from this behavior. So to anyone else reading this, definitely something to watch out for in this current version of Kunena.