Calendar Export Returns Blank Page

[Ben-Atherton]

Steps to reproduce

1. Click on the export calendar button

Expected behaviour

The calendar should export to an ICS file

Actual behaviour

A 500 error is returned

Server configuration

Operating system: Ubuntu 14.04
Web server: NGINX 1.11.1
Database: SQLite 3.8.2
PHP version: 5.6.23
ownCloud version: 9.0.2
Calendar version: 1.2.2
Updated from an older ownCloud or fresh install: Updated from older version
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 here.

No errors have been found.

List of activated apps:
Activity 2.2.1
Collaborative tags 0.2
Comments 0.2
Deleted files 0.8.0
Federation 0.0.4
First Run Wizard 1.1
Gallery 14.5.0
Mail Template Editor 0.1
Notifications 0.2.3
PDF Viewer 0.8.1
Provisioning API 0.4.1
Share Files 0.9.1
Text Editor 2.1
Update notification 0.1.0
Versions 1.2.0
Video player 0.9.8
Calendar 1.2.2
Tasks 0.9.1

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

Enabled:
  - activity: 2.2.1
  - calendar: 1.2.2
  - comments: 0.2
  - dav: 0.1.6
  - federatedfilesharing: 0.1.0
  - federation: 0.0.4
  - files: 1.4.4
  - files_pdfviewer: 0.8.1
  - files_sharing: 0.9.1
  - files_texteditor: 2.1
  - files_trashbin: 0.8.0
  - files_versions: 1.2.0
  - files_videoplayer: 0.9.8
  - firstrunwizard: 1.1
  - gallery: 14.5.0
  - notifications: 0.2.3
  - provisioning_api: 0.4.1
  - systemtags: 0.2
  - tasks: 0.9.1
  - templateeditor: 0.1
  - updatenotification: 0.1.0
Disabled:
  - encryption
  - external
  - files_external
  - user_external
  - user_ldap

The content of config/config.php:

'oc0ehvhhlr4f', 'passwordsalt' => 'XXXXX', 'secret' => 'XXXXX', 'trusted_domains' => array ( 0 => 'mydomain.com', ), 'datadirectory' => '/var/www/owncloud/data', 'overwrite.cli.url' => 'https://mydomain.com/owncloud', 'dbtype' => 'sqlite3', 'version' => '9.0.2.2', 'dbname' => 'owncloud', 'dbhost' => 'localhost', 'dbtableprefix' => 'oc_', 'dbuser' => 'XXXXX', 'dbpassword' => 'XXXXX', 'logtimezone' => 'UTC', 'installed' => true, 'maintenance' => false, 'theme' => '', 'loglevel' => 2, 'trashbin_retention_obligation' => 'auto', ); ``` 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 or Insert your config.php content here (Without the database password, passwordsalt and secret) ``` **Are you using external storage, if yes which one:** No **Are you using encryption:** No **Are you using an external user-backend, if yes which one:** No ### Client configuration **Browser:** Chrome 51 and Firefox 47 **Operating system:** Windows 7, Windows 10 and OSX El Capitan **CalDAV-clients:** ### Logs #### Web server error log ``` 2016/07/11 09:07:13 [error] 8955#8955: *2303 FastCGI sent in stderr: "PHP message: PHP Fatal error: Call to undefined function Sabre\VObject\mb_strcut() in /var/www/owncloud/3rdparty/sabre/vobject/lib/Property.php on line 247" while reading response header from upstream, client: 194.247.240.50, server: localhost, request: "GET /owncloud/remote.php/dav/calendars/Ben/personal?export HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php5.6-fpm.sock:", host: "mydomain.com" ``` #### ownCloud log (data/owncloud.log) ``` {"reqId":"wjr5eicXKcbL17zt563k","remoteAddr":"XXX.XXX.XXX.XX","app":"PHP","message":"Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php:\/\/input stream instead. at Unknown#0","level":3,"time":"2016-07-11T08:19:09+00:00","method":"POST","url":"\/owncloud\/index.php\/heartbeat","user":"Ben"} ``` #### Browser log ``` Insert your browser log here, this could for example include: No errors ```

[georgehrke]

Beginning with ownCloud 9 the CalDAV server became part of ownCloud's core and the calendar app is just a CalDAV client running in your browser.
Please report issues related to the CalDAV server in ownCloud’s core repo: https://github.com/owncloud/core/issues

[georgehrke]

please check if you have the mbstring php extension installed before reporting this in core