I’ve got something similar, there is a solution with a post in french wich help me Pas de contacts/agendas sous owncloud?
Before doing anything, you can make a backup of your Owncloud (not necessary if new installation)
ex:
cp -a /var/www/owncloud /home/admin/owncloud.ori
To resolve the issue, download the tarball from the site of owncloud.
Then you decompress it and just put it on the file applications of your server at the correct place, /var/www/owncloud I suppose.
Be carefull to put the rights like in this example.
Try this in console
$ sudo -i
# cd /tmp
# wget https://download.owncloud.org/community/owncloud-7.0.2.tar.bz2
# tar xvf owncloud-7.0.2.tar.bz2
# cd owncloud
# cp -a apps /var/www/owncloud/
# chown -R owncloud:owncloud /var/www/owncloud/apps
and after don’t forget to remove the files in /tmp
# rm -r owncloud-7.0.2.tar.bz2
# rm -r owncloud
For me it was perfect, then in your Owncloud, you just have to activate the Calendars, Contacts, Documents, pdfviewer, Pictures on the Add Aplications.
Good cloud