What´s come on?
I do not know what he asks me to do.
Can you help me, please
i did the following search and found a few closed issues at the bugtracker so it seems you’re not alone. Maybe you can find some information in the listed issues: https://github.com/owncloud/core/search?q=“oc_addressbooks”+“specified+key+was+too+long”&type=Issues
It seems even a search here at the forums: https://central.owncloud.org/search?q="oc_addressbooks"%20"specified%20key%20was%20too%20long" leads to a few existing threads which could help as well: