The DFSR member object for the Read-only Domain Controller %1!S! could not be deleted. This may occur if DFSR was unable ...

The DFSR member object for the Read-only Domain Controller %1!S! could not be deleted. This may occur if DFSR was unable to connect to the Primary Domain Controller. Please correct the problem and retry deletion by executing the command 'dfsrmig /DeleteRoDfsrMember' on a writable Domain Controller. 
 
Additional Information: 
Read-Only Domain Controller: %1!S! 
Error: %2!S! (%3!S!)