Adprep could not contact the Infrastructure FSMO %1. The Infrastructure FSMO must be reachable for this operation to proceed. ...

Adprep could not contact the Infrastructure FSMO %1. The Infrastructure FSMO must be reachable for this operation to proceed. 
[Status/Consequence]
The domain is not prepared.
[User Action]
Check the log file ADPrep.log in the %2 directory for possible cause of failure.