"Mit entfernter Datenbank zusammenführen"

Hello all,
I wanted to import three databases on a new Mac Book (Local SyncStore). Import started and all files were put on the MAC. Synchronization works with 2 of the databases. I have a problem with one of the databases. After import of all files it says “Mit entfernter Datenbank zusammenführen” (sorry, this is in german language, in english it might be “merge with removed database” . Synchronization with this particular database doesn’t work. How can I fix the problem?

Welcome @Plantronic

What is reported in DEVONthink’s Window > Log?