# NC 15.0.0, versions do not appear **URL:** \ **Category:** ℹ️ Support\ **Tags:** nc15, files-versions-app\ **Created:** [December 31, 2018, 11:11am UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200 "2018-12-31T11:11:29Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Cyril](https://help.nextcloud.com/user_avatar/help.nextcloud.com/cyril/32/2664_2.png) [@Cyril](https://help.nextcloud.com/u/Cyril)\ **Post date:** [December 31, 2018, 11:11am UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200/1 "2018-12-31T11:11:29Z")
Nextcloud version _(eg, 12.0.2)_:15.0.0.10 Operating system and version _(eg, Ubuntu 17.04)_: linux (shared hosting) Apache or nginx version _(eg, Apache 2.4.25)_: Apache 2.4.37 PHP version _(eg, 7.1)_: 7.2 The issue you are facing: Using the web interface, I cannot see/restore previous versions of my files. I know they exist, since I can see them in nextcloud-data/username/files\_versions folder, but when I click on “Versions” from the “details” screen of a particular file, nothing happens. Using Firefox debugging console, I get the following message (similar in Chrome console) at the exact moment I click on “Versions”: ```auto **`TypeError: this.sync is not a function** core.js:2101:14 fetch https://XXX/core/vendor/core.js:2101:14 nextPage https://XXX/index.php/js/files_versions/merged.js:270:4 setFileInfo https://XXX/index.php/js/files_versions/merged.js:360:5 selectTab https://XXX/index.php/js/files/merged-index.js:9972:4 _onClickTab https://XXX/index.php/js/files/merged-index.js:9876:4 _onClickTab self-hosted:975:17 dispatch https://XXX/core/vendor/core.js:3:6414 add/r.handle https://XXX/core/vendor/core.js:3:3224 ``` Is this the first time you’ve seen this error? _(Y/N)_: Y, I know that versioning used to work since I have used it in the past. I do not remember if I have used it successfully after the 15.0.0 upgrade. Steps to replicate it: 1. Create a file 2. Make a change so a new version is created 3. In the web interface, click on Details -\> Versions The output of your Nextcloud log in **Admin \> Logging** : Nothing relevant The output of your config.php file in `/path/to/nextcloud` (make sure you remove any identifiable information!): ```auto 'XXX', 'passwordsalt' => 'XXX', 'secret' => 'XXX', 'trusted_domains' => array ( 0 => 'XXX', ), 'datadirectory' => '/home/secondes/nextcloud-data', 'overwrite.cli.url' => 'XXX', 'dbtype' => 'mysql', 'version' => '15.0.0.10', 'dbname' => 'XXX', 'dbhost' => 'localhost', 'dbport' => '', 'dbtableprefix' => 'oc_', 'dbuser' => 'XXX', 'dbpassword' => 'XXX', 'logtimezone' => 'UTC', 'installed' => true, 'memcache.local' => '\\OC\\Memcache\\APCu', 'debug' => false, 'updater.secret' => 'XXX', 'maintenance' => false, 'enable_certificate_management' => false, 'mail_from_address' => 'nextcloud', 'mail_smtpmode' => 'smtp', 'mail_domain' => 'XXX', 'theme' => '', 'loglevel' => 2, 'updater.release.channel' => 'stable', 'versions_retention_obligation' => 'auto', 'mail_smtphost' => 'XXX', 'mail_smtpport' => '465', 'mail_smtpauth' => 1, 'mail_smtpname' => 'XXX', 'mail_smtppassword' => 'XXX', 'mail_smtpsecure' => 'ssl', ); ``` ---
**Author:** ![stratege1401](https://help.nextcloud.com/user_avatar/help.nextcloud.com/stratege1401/32/7570_2.png) [@stratege1401](https://help.nextcloud.com/u/stratege1401)\ **Post date:** [January 1, 2019, 7:18pm UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200/2 "2019-01-01T19:18:14Z")
this may be a real bug. Better post it on githuh [https://github.com/nextcloud/server/issues](https://github.com/nextcloud/server/issues) ---
**Author:** ![Cyril](https://help.nextcloud.com/user_avatar/help.nextcloud.com/cyril/32/2664_2.png) [@Cyril](https://help.nextcloud.com/u/Cyril)\ **Post date:** [January 3, 2019, 5:29pm UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200/3 "2019-01-03T17:29:08Z")
Thanks for the suggestion, I filed a bug report on Github. After a lot of tries, I finally discovered that, at least in my particular situation, **disabling the Comments application breaks the versioning app** as described above. Enabling again the Comments application restored the functionality as expected. Problem solved on my side, but I would be interested in knowing whether this is a general bug or only with my configuration 😕 EDIT: Actually, I can reproduce this on [demo.nextcloud.com](http://demo.nextcloud.com), so it seems it is a genuine bug ---
**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\ **Post date:** [December 4, 2024, 8:38am UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200/4 "2024-12-04T08:38:14Z")
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**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\ **Post date:** [December 9, 2024, 3:52pm UTC](https://help.nextcloud.com/t/nc-15-0-0-versions-do-not-appear/44200/5 "2024-12-09T15:52:14Z")