Today I tried to update from contacts 3.0 to version 3.0.1 on the Nextcloud Apps but it didn’t work. Nextcloud didn’t leave the maintenance-mode. After ending the maintence-mode by editing php.ini, I tried to uninstall the contact app. Error: “App “contacts” cannot be installed because appinfo file cannot be read.” Is there any possibility to reinstall the app?
Hello!
I’m guessing the archive failed or something. You can try to manually remove the files in your apps folder (or custom apps if you have a custom configuration set) 
Then download and enable (3.0.2 is out) again
That worked fine. I deleted the folder “contacts” and then reinstalled the app. Thank’s a lot.