The local domain controller hosts a writeable replica of the following directory partition; however, the source domain controller ...

The local domain controller hosts a writeable replica of the following directory partition; however, the source domain controller at the following network address hosts a read-only replica of this directory partition. Writeable replica directory partitions cannot replicate from read-only replicas because read-only replicas do not contain all of the attributes required to populate writeable replicas. 
 
Directory partition:
%1 
Source domain controller:
%4 
Network address:
%2 
 
As a result, the directory partition will no longer be replicated from this source domain controller.