The warning is simply there to let you know that the index is corrupt. RavenDB will attempt to recover the index itself. If the error continues to show, you can manually delete the index to force RavenDB to rebuild the index itself.
To delete the index, start ServiceControl in maintenance mode and browse to the indexes screen and simply delete the QueueAddressIndex index. Once deleted, restart ServiceControl in regular mode and RavenDB will rebuild the index instead of trying to repair it.