Server error 500 after installing new apps. no back to normal after disabling apps

Steps to reproduce

  1. install some apps and check an other page of the nexcloud. boom. 500 error

Expected behaviour

accessing the whole instance.

Actual behaviour

instead i have a screen showing error 500.
" Erreur interne du serveur

Le serveur est incapable d’exécuter votre requête.

Si cela se reproduit, veuillez envoyer les détails techniques ci-dessous à l’administrateur du serveur.

Le fichier journal du serveur peut fournir plus de renseignements.

Renseignements techniques

  • Adresse distante : 37.165.104.169
  • ID de la demande : AOljVTRIC13IrLOxcajn"

Server configuration

Operating system: Linux 4.15.0-65-generic #74-Ubuntu SMP Tue Sep 17 17:06:04 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Web server: nginx/1.16.1

**Database:**mysql Ver 14.14 Distrib 5.7.29, for Linux (x86_64) using EditLine wrapper

**PHP version:**PHP 7.2.24-0ubuntu0.18.04.3 (cli) (built: Feb 11 2020 15:55:52) ( NTS )
Copyright © 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright © 1998-2018 Zend Technologies
with Zend OPcache v7.2.24-0ubuntu0.18.04.3, Copyright © 1999-2018, by Zend Technologies

ownCloud version: 16.0.0

Updated from an older ownCloud or fresh install: yup, started at version 12 years ago.

Where did you install ownCloud from: the nextcloud site.

Signing status (ownCloud 9.0 and above):
?

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.

or 

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:
Enabled:

  • accessibility: 1.2.0
  • admin_audit: 1.6.0
  • bruteforcesettings: 1.5.0
  • calendar: 1.7.2
  • cloud_federation_api: 0.2.0
  • comments: 1.6.0
  • contacts: 3.2.0
  • cookbook: 0.6.1
  • dav: 1.9.2
  • deck: 0.6.6
  • dropit: 0.4.0
  • encryption: 2.4.0
  • event_update_notification: 0.3.4
  • external: 3.3.1
  • extract: 1.2.3
  • federatedfilesharing: 1.6.0
  • federation: 1.6.0
  • files: 1.11.0
  • files_downloadactivity: 1.5.0
  • files_markdown: 2.2.0
  • files_reader: 1.2.3
  • files_rightclick: 0.15.1
  • files_sharing: 1.8.0
  • files_trackdownloads: 1.5.0
  • files_trashbin: 1.6.0
  • files_versions: 1.9.0
  • lookup_server_connector: 1.4.0
  • music: 0.13.2
  • oauth2: 1.4.2
  • previewgenerator: 2.2.0
  • provisioning_api: 1.6.0
  • ransomware_detection: 0.5.2
  • ransomware_protection: 1.4.2
  • sharebymail: 1.6.0
  • social: 0.2.101
  • spreed: 6.0.4
  • systemtags: 1.6.0
  • text: 1.0.0
  • twofactor_backupcodes: 1.5.0
  • twofactor_nextcloud_notification: 1.1.2
  • twofactor_totp: 3.0.1
  • updatenotification: 1.6.0
  • user_saml: 2.4.2
  • user_usage_report: 1.1.2
  • workflowengine: 1.6.0
    Disabled:
  • carnet
  • circles
  • cospend
  • dashboard
  • dashboardcharts
  • drawio
  • files_external
  • files_mindmap
  • flowupload
  • news
  • notes
  • ocr
  • ocsms
  • onlyoffice
  • ownpad
  • passwords
  • polls
  • quota_warning
  • radio
  • tasks
  • testing
  • theming
  • twofactor_webauthn
  • unsplash
  • user_ldap

Are you using external storage, if yes which one: no other storage, dedicated OVH server (soyoustart)

Are you using encryption: yes

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

Logs

Web server error log

{
“reqId”: “5kt898xWITeP5LFxjxk6”,
“level”: 3,
“time”: “2020-03-26T17:33:09+00:00”,
“remoteAddr”: “37.165.104.169”,
“user”: “–”,
“app”: “no app in context”,
“method”: “GET”,
“url”: “/login”,
“message”: “JSCombiner: unable to cache: merged-login.js”,
“userAgent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.8) Gecko/20100101 Firefox/60.8”,
“version”: “16.0.0.9”
}
{
“reqId”: “5kt898xWITeP5LFxjxk6”,
“level”: 3,
“time”: “2020-03-26T17:33:09+00:00”,
“remoteAddr”: “37.165.104.169”,
“user”: “–”,
“app”: “index”,
“method”: “GET”,
“url”: “/login”,
“message”: {
“Exception”: “Error”,
“Message”: “Class ‘OCP\Config’ not found”,
“Code”: 0,
“Trace”: [
{
“file”: “/home/www/tykayn/nextcloud/apps/files_reader/lib/Hooks.php”,
“line”: 41,
“function”: “get”,
“class”: “OCA\Files_Reader\Config”,
“type”: “::”,
“args”: [
“epub_enable”,
“true”
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/legacy/hook.php”,
“line”: 106,
“function”: “announce_settings”,
“class”: “OCA\Files_Reader\Hooks”,
“type”: “::”,
“args”: [
{
“array”: {
“oc_debug”: “false”,
“oc_isadmin”: “false”,
“backendAllowsPasswordConfirmation”: “true”,
“oc_dataURL”: “false”,
“oc_webroot”: “”"",
“oc_appswebroots”: “{“accessibility”:”/apps/accessibility",“admin_audit”:"/apps/admin_audit",“bruteforcesettings”:"/apps/bruteforcesettings",“calendar”:"/apps/calendar",“carnet”:"/apps/carnet",“cloud_federation_api”:"/apps/cloud_federation_api",“comments”:"/apps/comments",“contacts”:"/apps/contacts",“cookbook”:"/apps/cookbook",“dashboardcharts”:"/apps/dashboardcharts",“dav”:"/apps/dav",“deck”:"/apps/deck",“dropit”:"/apps/dropit",“encryption”:"/apps/encryption",“event_update_notification”:"/apps/event_update_notification",“external”:"/apps/external",“extract”:"/apps/extract",“federatedfilesharing”:"/apps/federatedfilesharing",“federation”:"/apps/federation",“files”:"/apps/files",“files_downloadactivity”:"/apps/files_downloadactivity",“files_markdown”:"/apps/files_markdown",“files_reader”:"/apps/files_reader",“files_rightclick”:"/apps/files_rightclick",“files_sharing”:"/apps/files_sharing",“files_trackdownloads”:"/apps/files_trackdownloads",“files_trashbin”:"/apps/files_trashbin",“files_versions”:"/apps/files_versions",“lookup_server_connector”:"/apps/lookup_server_connector",“music”:"/apps/music",“news”:"/apps/news",“oauth2”:"/apps/oauth2",“ocr”:"/apps/ocr",“onlyoffice”:"/apps/onlyoffice",“polls”:"/apps/polls",“previewgenerator”:"/apps/previewgenerator",“provisioning_api”:"/apps/provisioning_api",“quota_warning”:"/apps/quota_warning",“ransomware_detection”:"/apps/ransomware_detection",“ransomware_protection”:"/apps/ransomware_protection",“sharebymail”:"/apps/sharebymail",“social”:"/apps/social",“spreed”:"/apps/spreed",“systemtags”:"/apps/systemtags",“text”:"/apps/text",“theming”:"/apps/theming",“twofactor_backupcodes”:"/apps/twofactor_backupcodes",“twofactor_nextcloud_notification”:"/apps/twofactor_nextcloud_notification",“twofactor_totp”:"/apps/twofactor_totp",“updatenotification”:"/apps/updatenotification",“user_saml”:"/apps/user_saml",“user_usage_report”:"/apps/user_usage_report",“workflowengine”:"/apps/workflowengine"}",
“datepickerFormatDate”: ““dd\/MM\/y””,
“nc_lastLogin”: 0,
“nc_pageLoad”: 1585243989,
“dayNames”: “[“Dimanche”,“Lundi”,“Mardi”,“Mercredi”,“Jeudi”,“Vendredi”,“Samedi”]”,
“dayNamesShort”: “[“Dim.”,“Lun.”,“Mar.”,“Mer.”,“Jeu.”,“Ven.”,“Sam.”]”,
“dayNamesMin”: “[“Di”,“Lu”,“Ma”,“Me”,“Je”,“Ve”,“Sa”]”,
“monthNames”: “[“Janvier”,“F\u00e9vrier”,“Mars”,“Avril”,“Mai”,“Juin”,“Juillet”,“Ao\u00fbt”,“Septembre”,“Octobre”,“Novembre”,“D\u00e9cembre”]”,
“monthNamesShort”: “[“Jan.”,“F\u00e9v.”,“Mars”,“Avr.”,“Mai”,“Juin”,“Juil.”,“Ao\u00fbt”,“Sep.”,“Oct.”,“Nov.”,“D\u00e9c.”]”,
“firstDay”: “1”,
“oc_config”: “{“session_lifetime”:1440,“session_keepalive”:true,“version”:“16.0.0.9”,“versionstring”:“16.0.0”,“enable_avatars”:true,“lost_password_link”:null,“modRewriteWorking”:true,“sharing.maxAutocompleteResults”:0,“sharing.minSearchStringLength”:0,“blacklist_files_regex”:”\\.(part|filepart)$"}",
“oc_appconfig”: “{“core”:{“defaultExpireDateEnabled”:false,“defaultExpireDate”:null,“defaultExpireDateEnforced”:null,“enforcePasswordForPublicLink”:false,“enableLinkPasswordByDefault”:false,“sharingDisabledForUser”:false,“resharingAllowed”:true,“remoteShareAllowed”:true,“federatedCloudShareDoc”:“https:\/\/docs.nextcloud.com\/server\/16\/go.php?to=user-sharing-federated”,“allowGroupSharing”:true,“public_webfinger”:“social\/lib\/webfinger.php”},“files”:{“max_chunk_size”:10485760}}”,
“oc_defaults”: “{“entity”:“Cloud Bliss”,“name”:“Cloud Bliss”,“title”:“Cloud Bliss”,“baseUrl”:“https:\/\/cloud.tykayn.fr”,“syncClientUrl”:“https:\/\/nextcloud.com\/install\/#install-clients”,“docBaseUrl”:“https:\/\/docs.nextcloud.com”,“docPlaceholderUrl”:“https:\/\/docs.nextcloud.com\/server\/16\/go.php?to=PLACEHOLDER”,“slogan”:“un lieu s\u00fbr pour toutes vos donn\u00e9es”,“logoClaim”:”",“shortFooter”:"<a href=\“https:\/\/cloud.tykayn.fr\” target=\"_blank\" rel=\“noreferrer noopener\” class=\“entity-name\”>Cloud Bliss<\/a> \u2013 un lieu s\u00fbr pour toutes vos donn\u00e9es",“longFooter”:"<a href=\“https:\/\/cloud.tykayn.fr\” target=\"_blank\" rel=\“noreferrer noopener\” class=\“entity-name\”>Cloud Bliss<\/a> \u2013 un lieu s\u00fbr pour toutes vos donn\u00e9es",“folder”:""}",
“oc_capabilities”: “{“core”:{“pollinterval”:60,“webdav-root”:“remote.php\/webdav”},“bruteforce”:{“delay”:0},“ocm”:{“enabled”:true,“apiVersion”:“1.0-proposal1”,“endPoint”:“https:\/\/cloud.tykayn.fr\/ocm”,“resourceTypes”:[{“name”:“file”,“shareTypes”:[“user”,“group”],“protocols”:{“webdav”:”\/public.php\/webdav\/"}}]},“deck”:{“version”:“0.6.6”},“dav”:{“chunking”:“1.0”},“files_sharing”:{“api_enabled”:true,“public”:{“enabled”:true,“password”:{“enforced”:false},“expire_date”:{“enabled”:false},“multiple_links”:true,“send_mail”:false,“upload”:true,“upload_files_drop”:true},“resharing”:true,“user”:{“send_mail”:false,“expire_date”:{“enabled”:true}},“group_sharing”:true,“group”:{“enabled”:true,“expire_date”:{“enabled”:true}},“default_permissions”:31,“federation”:{“outgoing”:true,“incoming”:true,“expire_date”:{“enabled”:true}},“sharebymail”:{“enabled”:true,“upload_files_drop”:{“enabled”:true},“password”:{“enabled”:true},“expire_date”:{“enabled”:true}}},“files”:{“undelete”:true,“bigfilechunking”:true,“blacklisted_files”:[".htaccess"],“versioning”:true},“theming”:{“name”:“Cloud Bliss”,“url”:“https:\/\/cloud.tykayn.fr”,“slogan”:“un lieu s\u00fbr pour toutes vos donn\u00e9es”,“color”:"#1C98C9",“color-text”:"#ffffff",“color-element”:"#1C98C9",“logo”:“https:\/\/cloud.tykayn.fr\/apps\/theming\/image\/logo?useSvg=1&v=7”,“background”:“https:\/\/cloud.tykayn.fr\/apps\/theming\/image\/background?v=7”,“background-plain”:false,“background-default”:false},“dropit”:{“enabled”:true,“upload”:{“files”:{“url”:“https:\/\/cloud.tykayn.fr\/apps\/dropit\/drop”,“param”:“data”},“text”:{“url”:“https:\/\/cloud.tykayn.fr\/apps\/dropit\/text”,“param”:“text”}}},“external”:{“v1”:[“sites”,“device”,“groups”,“redirect”]},“spreed”:{“features”:[“audio”,“video”,“chat-v2”,“guest-signaling”,“empty-group-room”,“guest-display-names”,“multi-room-users”,“favorites”,“last-room-activity”,“no-ping”,“system-messages”,“mention-flag”,“in-call-flags”,“notification-levels”,“invite-groups-and-mails”,“locked-one-to-one-rooms”,“read-only-rooms”],“config”:{“chat”:{“max-length”:1000}}}}"
}
}
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/Template/JSConfigHelper.php”,
“line”: 287,
“function”: “emit”,
“class”: “OC_Hook”,
“type”: “::”,
“args”: [
“\OCP\Config”,
“js”,
{
“array”: {
“oc_debug”: “false”,
“oc_isadmin”: “false”,
“backendAllowsPasswordConfirmation”: “true”,
“oc_dataURL”: “false”,
“oc_webroot”: “”"",
“oc_appswebroots”: “{“accessibility”:”/apps/accessibility",“admin_audit”:"/apps/admin_audit",“bruteforcesettings”:"/apps/bruteforcesettings",“calendar”:"/apps/calendar",“carnet”:"/apps/carnet",“cloud_federation_api”:"/apps/cloud_federation_api",“comments”:"/apps/comments",“contacts”:"/apps/contacts",“cookbook”:"/apps/cookbook",“dashboardcharts”:"/apps/dashboardcharts",“dav”:"/apps/dav",“deck”:"/apps/deck",“dropit”:"/apps/dropit",“encryption”:"/apps/encryption",“event_update_notification”:"/apps/event_update_notification",“external”:"/apps/external",“extract”:"/apps/extract",“federatedfilesharing”:"/apps/federatedfilesharing",“federation”:"/apps/federation",“files”:"/apps/files",“files_downloadactivity”:"/apps/files_downloadactivity",“files_markdown”:"/apps/files_markdown",“files_reader”:"/apps/files_reader",“files_rightclick”:"/apps/files_rightclick",“files_sharing”:"/apps/files_sharing",“files_trackdownloads”:"/apps/files_trackdownloads",“files_trashbin”:"/apps/files_trashbin",“files_versions”:"/apps/files_versions",“lookup_server_connector”:"/apps/lookup_server_connector",“music”:"/apps/music",“news”:"/apps/news",“oauth2”:"/apps/oauth2",“ocr”:"/apps/ocr",“onlyoffice”:"/apps/onlyoffice",“polls”:"/apps/polls",“previewgenerator”:"/apps/previewgenerator",“provisioning_api”:"/apps/provisioning_api",“quota_warning”:"/apps/quota_warning",“ransomware_detection”:"/apps/ransomware_detection",“ransomware_protection”:"/apps/ransomware_protection",“sharebymail”:"/apps/sharebymail",“social”:"/apps/social",“spreed”:"/apps/spreed",“systemtags”:"/apps/systemtags",“text”:"/apps/text",“theming”:"/apps/theming",“twofactor_backupcodes”:"/apps/twofactor_backupcodes",“twofactor_nextcloud_notification”:"/apps/twofactor_nextcloud_notification",“twofactor_totp”:"/apps/twofactor_totp",“updatenotification”:"/apps/updatenotification",“user_saml”:"/apps/user_saml",“user_usage_report”:"/apps/user_usage_report",“workflowengine”:"/apps/workflowengine"}",
“datepickerFormatDate”: ““dd\/MM\/y””,
“nc_lastLogin”: 0,
“nc_pageLoad”: 1585243989,
“dayNames”: “[“Dimanche”,“Lundi”,“Mardi”,“Mercredi”,“Jeudi”,“Vendredi”,“Samedi”]”,
“dayNamesShort”: “[“Dim.”,“Lun.”,“Mar.”,“Mer.”,“Jeu.”,“Ven.”,“Sam.”]”,
“dayNamesMin”: “[“Di”,“Lu”,“Ma”,“Me”,“Je”,“Ve”,“Sa”]”,
“monthNames”: “[“Janvier”,“F\u00e9vrier”,“Mars”,“Avril”,“Mai”,“Juin”,“Juillet”,“Ao\u00fbt”,“Septembre”,“Octobre”,“Novembre”,“D\u00e9cembre”]”,
“monthNamesShort”: “[“Jan.”,“F\u00e9v.”,“Mars”,“Avr.”,“Mai”,“Juin”,“Juil.”,“Ao\u00fbt”,“Sep.”,“Oct.”,“Nov.”,“D\u00e9c.”]”,
“firstDay”: “1”,
“oc_config”: “{“session_lifetime”:1440,“session_keepalive”:true,“version”:“16.0.0.9”,“versionstring”:“16.0.0”,“enable_avatars”:true,“lost_password_link”:null,“modRewriteWorking”:true,“sharing.maxAutocompleteResults”:0,“sharing.minSearchStringLength”:0,“blacklist_files_regex”:”\\.(part|filepart)$"}",
“oc_appconfig”: “{“core”:{“defaultExpireDateEnabled”:false,“defaultExpireDate”:null,“defaultExpireDateEnforced”:null,“enforcePasswordForPublicLink”:false,“enableLinkPasswordByDefault”:false,“sharingDisabledForUser”:false,“resharingAllowed”:true,“remoteShareAllowed”:true,“federatedCloudShareDoc”:“https:\/\/docs.nextcloud.com\/server\/16\/go.php?to=user-sharing-federated”,“allowGroupSharing”:true,“public_webfinger”:“social\/lib\/webfinger.php”},“files”:{“max_chunk_size”:10485760}}”,
“oc_defaults”: “{“entity”:“Cloud Bliss”,“name”:“Cloud Bliss”,“title”:“Cloud Bliss”,“baseUrl”:“https:\/\/cloud.tykayn.fr”,“syncClientUrl”:“https:\/\/nextcloud.com\/install\/#install-clients”,“docBaseUrl”:“https:\/\/docs.nextcloud.com”,“docPlaceholderUrl”:“https:\/\/docs.nextcloud.com\/server\/16\/go.php?to=PLACEHOLDER”,“slogan”:“un lieu s\u00fbr pour toutes vos donn\u00e9es”,“logoClaim”:”",“shortFooter”:"<a href=\“https:\/\/cloud.tykayn.fr\” target=\"_blank\" rel=\“noreferrer noopener\” class=\“entity-name\”>Cloud Bliss<\/a> \u2013 un lieu s\u00fbr pour toutes vos donn\u00e9es",“longFooter”:"<a href=\“https:\/\/cloud.tykayn.fr\” target=\"_blank\" rel=\“noreferrer noopener\” class=\“entity-name\”>Cloud Bliss<\/a> \u2013 un lieu s\u00fbr pour toutes vos donn\u00e9es",“folder”:""}",
“oc_capabilities”: “{“core”:{“pollinterval”:60,“webdav-root”:“remote.php\/webdav”},“bruteforce”:{“delay”:0},“ocm”:{“enabled”:true,“apiVersion”:“1.0-proposal1”,“endPoint”:“https:\/\/cloud.tykayn.fr\/ocm”,“resourceTypes”:[{“name”:“file”,“shareTypes”:[“user”,“group”],“protocols”:{“webdav”:”\/public.php\/webdav\/"}}]},“deck”:{“version”:“0.6.6”},“dav”:{“chunking”:“1.0”},“files_sharing”:{“api_enabled”:true,“public”:{“enabled”:true,“password”:{“enforced”:false},“expire_date”:{“enabled”:false},“multiple_links”:true,“send_mail”:false,“upload”:true,“upload_files_drop”:true},“resharing”:true,“user”:{“send_mail”:false,“expire_date”:{“enabled”:true}},“group_sharing”:true,“group”:{“enabled”:true,“expire_date”:{“enabled”:true}},“default_permissions”:31,“federation”:{“outgoing”:true,“incoming”:true,“expire_date”:{“enabled”:true}},“sharebymail”:{“enabled”:true,“upload_files_drop”:{“enabled”:true},“password”:{“enabled”:true},“expire_date”:{“enabled”:true}}},“files”:{“undelete”:true,“bigfilechunking”:true,“blacklisted_files”:[".htaccess"],“versioning”:true},“theming”:{“name”:“Cloud Bliss”,“url”:“https:\/\/cloud.tykayn.fr”,“slogan”:“un lieu s\u00fbr pour toutes vos donn\u00e9es”,“color”:"#1C98C9",“color-text”:"#ffffff",“color-element”:"#1C98C9",“logo”:“https:\/\/cloud.tykayn.fr\/apps\/theming\/image\/logo?useSvg=1&v=7”,“background”:“https:\/\/cloud.tykayn.fr\/apps\/theming\/image\/background?v=7”,“background-plain”:false,“background-default”:false},“dropit”:{“enabled”:true,“upload”:{“files”:{“url”:“https:\/\/cloud.tykayn.fr\/apps\/dropit\/drop”,“param”:“data”},“text”:{“url”:“https:\/\/cloud.tykayn.fr\/apps\/dropit\/text”,“param”:“text”}}},“external”:{“v1”:[“sites”,“device”,“groups”,“redirect”]},“spreed”:{“features”:[“audio”,“video”,“chat-v2”,“guest-signaling”,“empty-group-room”,“guest-display-names”,“multi-room-users”,“favorites”,“last-room-activity”,“no-ping”,“system-messages”,“mention-flag”,“in-call-flags”,“notification-levels”,“invite-groups-and-mails”,“locked-one-to-one-rooms”,“read-only-rooms”],“config”:{“chat”:{“max-length”:1000}}}}"
}
}
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/TemplateLayout.php”,
“line”: 176,
“function”: “getConfig”,
“class”: “OC\Template\JSConfigHelper”,
“type”: “->”,
“args”: []
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/legacy/template.php”,
“line”: 183,
“function”: “__construct”,
“class”: “OC\TemplateLayout”,
“type”: “->”,
“args”: [
“guest”,
“core”
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/public/AppFramework/Http/TemplateResponse.php”,
“line”: 160,
“function”: “fetchPage”,
“class”: “OC_Template”,
“type”: “->”,
“args”: [
{
“messages”: [],
“loginName”: “”,
“user_autofocus”: true,
“login_form_autocomplete”: “on”,
“resetPasswordLink”: “”,
“canResetPassword”: true,
“alt_login”: [],
“throttle_delay”: 0
}
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/AppFramework/Http/Dispatcher.php”,
“line”: 119,
“function”: “render”,
“class”: “OCP\AppFramework\Http\TemplateResponse”,
“type”: “->”,
“args”: []
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/AppFramework/App.php”,
“line”: 126,
“function”: “dispatch”,
“class”: “OC\AppFramework\Http\Dispatcher”,
“type”: “->”,
“args”: [
{
class”: “OC\Core\Controller\LoginController”
},
“showLoginForm”
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php”,
“line”: 47,
“function”: “main”,
“class”: “OC\AppFramework\App”,
“type”: “::”,
“args”: [
“OC\Core\Controller\LoginController”,
“showLoginForm”,
{
class”: “OC\AppFramework\DependencyInjection\DIContainer”
},
{
“_route”: “core.login.showLoginForm”
}
]
},
{
“function”: “__invoke”,
“class”: “OC\AppFramework\Routing\RouteActionHandler”,
“type”: “->”,
“args”: [
{
“_route”: “core.login.showLoginForm”
}
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/private/Route/Router.php”,
“line”: 297,
“function”: “call_user_func”,
“args”: [
{
class”: “OC\AppFramework\Routing\RouteActionHandler”
},
{
“_route”: “core.login.showLoginForm”
}
]
},
{
“file”: “/home/www/tykayn/nextcloud/lib/base.php”,
“line”: 975,
“function”: “match”,
“class”: “OC\Route\Router”,
“type”: “->”,
“args”: [
“/login”
]
},
{
“file”: “/home/www/tykayn/nextcloud/index.php”,
“line”: 42,
“function”: “handleRequest”,
“class”: “OC”,
“type”: “::”,
“args”: []
}
],
“File”: “/home/www/tykayn/nextcloud/apps/files_reader/lib/config.php”,
“Line”: 28,
“CustomMessage”: “–”
},
“userAgent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.8) Gecko/20100101 Firefox/60.8”,
“version”: “16.0.0.9”
}
{
“reqId”: “5kt898xWITeP5LFxjxk6”,
“level”: 3,
“time”: “2020-03-26T17:33:09+00:00”,
“remoteAddr”: “37.165.104.169”,
“user”: “–”,
“app”: “no app in context”,
“method”: “GET”,
“url”: “/login”,
“message”: “JSCombiner: unable to cache: merged-login.js”,
“userAgent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.8) Gecko/20100101 Firefox/60.8”,
“version”: “16.0.0.9”
}

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

found how to debug that, i had to disable the app ebook_reader and everything works fine again.
i used the command line.

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