Help me Please in the admin page

What´s come on?

I do not know what he asks me to do.

Can you help me, please

Hey,

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: Issue search results · GitHub

It seems even a search here at the forums: Search results for '"oc_addressbooks" "specified key was too long"' - ownCloud Central leads to a few existing threads which could help as well: