Was bedeutet diese Fehlermeldung?

Hallo,

mein owncloud läuft ohne für mich erkennbare Probleme. Gleichzeitig sehe ich im log immer wieder diese Fehlermeldung:

Exception: {"Message":"HTTP\/1.1 412 An If-Match header was specified, but none of the specified the ETags matched.","Exception":"Sabre\DAV\Exception\PreconditionFailed","Code":0,"Trace":"#0 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(454): Sabre\DAV\Server->checkPreconditions(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#1 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(248): Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#2 \/var\/www\/owncloud\/apps\/dav\/appinfo\/v1\/carddav.php(82): Sabre\DAV\Server->exec()\n#3 \/var\/www\/owncloud\/remote.php(164): require_once('\/var\/www\/ownclo...')\n#4 {main}","File":"\/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","Line":1267,"User":"my_username"}

Was sollte mir diese Fehlermdeldung sagen?

Wie bekomme ich sie weg?

Schritte zum Reproduzieren
1. Der Owncloud läuft - was die Fehlermeldung auslöst ist mir nicht bekannt.

Erwartetes Verhalten
Keine Fehlermeldung

Aktuelles Verhalten
Im log Debug carddav steht die obige Fehlermeldung.

Server-Konfiguration
Betriebssystem: Ubuntu 16.04
Webserver-Typ: apache2
Datenbank-Typ: mysql
PHP-Version:
ownCloud-Version (siehe ownCloud Administrationsseite): 9.1.0.15
Von einer älteren ownCloud-Version aktualisiert oder neu installiert?: Mit Upgrade von Ubuntu 14.04 auf 16.04 neu installiert

Technical information
=====================
The following list covers which files have failed the integrity check. Please read
the previous linked documentation to learn more about the errors and how to fix
them.
Results
=======
- core
	- EXTRA_FILE
		- core/doc/user/_images/new_project_google_drive.png
		- core/doc/user/_images/external_google_drive_2_verify.png
		- core/doc/user/_images/oc_user_preferences.png
		- core/doc/user/_images/oc_share_with_options.png
		- core/doc/user/_images/share_link.png
		- core/doc/user/_images/oc_files_share.png
		- core/doc/user/_images/new_project_google_drive_api_settings.png
		- core/doc/user/_images/oc_personal_settings_window.png
		- core/doc/user/_images/deleted_files.png
		- core/doc/user/_images/new_project_google_drive_new_client.png
		- core/doc/user/_images/new_project_google_drive_branding.png
		- core/doc/user/_images/encryption_enabling.png
		- core/doc/user/_images/apis_auth_google_drive.png
		- core/doc/user/_images/external_google_drive_1_sign_in.png
		- core/doc/user/_images/external_google_drive_5_setup_ownCloud.png
		- core/doc/user/_images/oc_filesweb.png
		- core/doc/user/_images/external_google_drive_6_accept.png
		- core/doc/user/_images/dolphin_webdav.png
		- core/doc/user/_images/share_link_adding.png
		- core/doc/user/_images/oc_share_expiration_calendar.png
		- core/doc/user/_sources/migration.txt
		- core/doc/user/migration.html
		- core/doc/admin/_images/1000000000000631000000E19D116AA0.png
		- core/doc/admin/_images/10000000000005B90000007866D92D14.png
		- core/doc/admin/_images/10000000000000950000004412998BE7.png
		- core/doc/admin/_images/10000000000005AF00000074604B1A67.png
		- core/doc/admin/_images/10000000000004C0000000795BB2C146.png
		- core/doc/admin/_images/winserverroles.jpg
		- core/doc/admin/_images/10000000000001FD000000DF8D2D7546.png
		- core/doc/admin/_images/10000000000006000000005EDA7B96BE.png
		- core/doc/admin/_images/10000000000002840000016729388B7F.png
		- core/doc/admin/_images/oc_select_an_app_window.png
		- core/doc/admin/_images/10000000000001880000007EA4444400.png
		- core/doc/admin/_images/oc_admin_user_manage.png
		- core/doc/admin/_images/100000000000061D0000007047877972.png
		- core/doc/admin/_images/10000000000006060000006A0106CA0C.png
		- core/doc/admin/_images/100000000000053A00000067708C8F53.png
		- core/doc/admin/_images/10000000000003A6000002A9C7A660BE.png
		- core/doc/admin/_images/10000000000005FF0000005F35710398.png
		- core/doc/admin/_images/100000000000061E0000006BCF9ECC0B.png
		- core/doc/admin/_images/oc_updater_select.png
		- core/doc/admin/_images/oc_personal_settings_dropdown_admin.png
		- core/doc/admin/_images/10000000000003DF00000071A41D8A1F.png
		- core/doc/admin/_images/1000000000000372000002AF943ADDA0.png
		- core/doc/admin/_images/10000000000005D50000009458C5EE48.png
		- core/doc/admin/_images/100000000000063F00000090AAE1FA4A.png
		- core/doc/admin/_images/oc_updater_enable.png
		- core/doc/admin/_images/1000000000000247000000A77440E4D3.png
		- core/doc/admin/_images/10000000000000CD000000ECA8DE7780.png
		- core/doc/admin/_images/10000000000005E20000009B1BA5A8CF.png
		- core/doc/admin/_images/10000000000005EB000000A68BA73E2D.png
		- core/doc/admin/_images/ucs-app-center-module.png
		- core/doc/admin/_images/10000000000005EC00000073E678DFEC.png
		- core/doc/admin/_images/install-wizard-advanced.png
		- core/doc/admin/_images/10000000000005D00000003B29340A7A.png
		- core/doc/admin/_images/10000000000005F70000005F0912E904.png
		- core/doc/admin/_images/100000000000062A0000005F61A18950.png
		- core/doc/admin/_images/10000000000000A800000073F49785A6.png
		- core/doc/admin/_images/10000000000002950000021E245F6883.png
		- core/doc/admin/_images/100000000000060300000065DF96536B.png
		- core/doc/admin/_images/10000000000005C30000006CAFFAAD61.png
		- core/doc/admin/_images/ucs-app-center-install.png
		- core/doc/admin/_images/10000000000004770000008AAF3CFFDB.png
		- core/doc/admin/_images/10000000000004100000005657010336.png
		- core/doc/admin/_images/100000000000027B0000011D10F70F88.png
		- core/doc/admin/_images/10000000000005BB0000007C1DF71FA7.png
		- core/doc/admin/_images/10000000000005FA0000005CE8491B77.png
		- core/doc/admin/_images/10000000000000B600000120706C3C75.png
		- core/doc/admin/_images/10000000000005970000006AE23997C9.png
		- core/doc/admin/_images/100000000000061A0000006FC014C3A4.png
		- core/doc/admin/_images/win7features.jpg
		- core/doc/admin/_images/10000000000005E6000000676902E040.png
		- core/doc/admin/_images/10000000000002170000004A27056037.png
		- core/doc/admin/_images/10000000000005F70000007E43DB8026.png
		- core/doc/admin/_images/10000000000001D30000014DC251C948.png
		- core/doc/admin/_images/1000000000000552000000BF22E90239.png
		- core/doc/admin/_images/100000000000003800000018D49F1CE7.png
		- core/doc/admin/_images/10000000000001980000009271BE0D26.png
		- core/doc/admin/_images/10000000000003A60000011E274A1A28.png
		- core/doc/admin/_images/10000000000003B30000021B5EE5D338.png
		- core/doc/admin/configuration/auth_ldap.html
		- core/doc/admin/configuration/configuration_knowledgebase.html
		- core/doc/admin/configuration/configuration_apps.html
		- core/doc/admin/configuration/configuration_language.html
		- core/doc/admin/configuration/custom_mount_config.html
		- core/doc/admin/configuration/configuring_big_file_upload.html
		- core/doc/admin/configuration/custom_mount_config_gui.html
		- core/doc/admin/configuration/configuration_logging.html
		- core/doc/admin/configuration/configuration_assets.html
		- core/doc/admin/configuration/configuration_mail.html
		- core/doc/admin/configuration/custom_user_backend.html
		- core/doc/admin/configuration/server_to_server_managing.html
		- core/doc/admin/configuration/configuration_database.html
		- core/doc/admin/configuration/index.html
		- core/doc/admin/configuration/configuration_preview.html
		- core/doc/admin/configuration/configuration_reverseproxy.html
		- core/doc/admin/configuration/configuration_custom_clients.html
		- core/doc/admin/configuration/configuration_encryption.html
		- core/doc/admin/configuration/xsendfile.html
		- core/doc/admin/configuration/configuration_3rdparty.html
		- core/doc/admin/configuration/configuration_automation.html
		- core/doc/admin/configuration/background_jobs.html
		- core/doc/admin/configuration/configuration_users.html
		- core/doc/admin/installation/installation_others.html
		- core/doc/admin/installation/installation_appliance.html
		- core/doc/admin/installation/installation_windows.html
		- core/doc/admin/installation/installation_macos.html
		- core/doc/admin/installation/installation_source.html
		- core/doc/admin/installation/installation_linux.html
		- core/doc/admin/installation/installation_ucs.html
		- core/doc/admin/_sources/configuration/configuration_knowledgebase.txt
		- core/doc/admin/_sources/configuration/configuration_reverseproxy.txt
		- core/doc/admin/_sources/configuration/configuration_custom_clients.txt
		- core/doc/admin/_sources/configuration/configuration_database.txt
		- core/doc/admin/_sources/configuration/configuration_logging.txt
		- core/doc/admin/_sources/configuration/configuring_big_file_upload.txt
		- core/doc/admin/_sources/configuration/configuration_3rdparty.txt
		- core/doc/admin/_sources/configuration/configuration_preview.txt
		- core/doc/admin/_sources/configuration/configuration_apps.txt
		- core/doc/admin/_sources/configuration/configuration_language.txt
		- core/doc/admin/_sources/configuration/index.txt
		- core/doc/admin/_sources/configuration/configuration_mail.txt
		- core/doc/admin/_sources/configuration/configuration_users.txt
		- core/doc/admin/_sources/configuration/configuration_automation.txt
		- core/doc/admin/_sources/configuration/configuration_encryption.txt
		- core/doc/admin/_sources/configuration/custom_mount_config_gui.txt
		- core/doc/admin/_sources/configuration/server_to_server_managing.txt
		- core/doc/admin/_sources/configuration/background_jobs.txt
		- core/doc/admin/_sources/configuration/configuration_assets.txt
		- core/doc/admin/_sources/configuration/auth_ldap.txt
		- core/doc/admin/_sources/configuration/xsendfile.txt
		- core/doc/admin/_sources/configuration/custom_mount_config.txt
		- core/doc/admin/_sources/configuration/custom_user_backend.txt
		- core/doc/admin/_sources/installation/installation_source.txt
		- core/doc/admin/_sources/installation/installation_macos.txt
		- core/doc/admin/_sources/installation/installation_ucs.txt
		- core/doc/admin/_sources/installation/installation_others.txt
		- core/doc/admin/_sources/installation/installation_appliance.txt
		- core/doc/admin/_sources/installation/installation_linux.txt
		- core/doc/admin/_sources/installation/installation_windows.txt
		- 3rdparty/js/md5/README.md
		- 3rdparty/js/chosen/README.md
		- 3rdparty/js/strengthify/README.md
		- 3rdparty/fontawesome/README.md
		- 3rdparty/mcnetic/phpzipstreamer/README.md
		- 3rdparty/kriswallsmith/assetic/README.md
		- 3rdparty/symfony/routing/Symfony/Component/Routing/README.md
		- 3rdparty/symfony/console/Symfony/Component/Console/README.md
		- 3rdparty/symfony/process/Symfony/Component/Process/README.md
		- 3rdparty/symfony/event-dispatcher/Symfony/Component/EventDispatcher/README.md
		- 3rdparty/doctrine/dbal/docs/examples/sharding/README.md
		- 3rdparty/doctrine/dbal/lib/Doctrine/DBAL/README.markdown
		- 3rdparty/phpseclib/phpseclib/README.md
		- 3rdparty/phpass/c/Makefile
		- 3rdparty/phpass/c/crypt_private.c
		- 3rdparty/Patchwork/README.md
		- 3rdparty/Jcrop/README.md
		- 3rdparty/phpmailer/phpmailer/README.md
		- 3rdparty/zxcvbn/README.md
		- Release.key
		- php5-apcu_4.0.7-1build1~ubuntu14.04.1_amd64.deb
		- lib/l10n/ur.php
		- lib/private/preview/unknown.php
		- lib/private/preview/movies.php
		- settings/ajax/excludegroups.php
		- settings/admin/controller.php
- gallery
	- EXTRA_FILE
		- README.md
- firstrunwizard
	- EXTRA_FILE
		- README.md
- files_pdfviewer
	- EXTRA_FILE
		- README.md
- files_external
	- EXTRA_FILE
		- 3rdparty/Dropbox/README.md
- files_texteditor
	- EXTRA_FILE
		- js/vendor/ace/src-noconflict/mode-text.js
		- README.md
- user_external
	- EXTRA_FILE
		- README.md
- user_ldap
	- EXTRA_FILE
		- tests/data/sid.dat
- activity
	- EXTRA_FILE
		- l10n/l10n.pl
		- l10n/ja_JP.php
		- README.md
Raw output
==========
...

Hi,

erstelle am besten nen Bugreport dazu:

https://github.com/owncloud/core/issues

Da sollte Dir jemand ggf. mitteilen können was die Fehlermeldung bedeutet.

ref: https://github.com/owncloud/core/issues/26211