Am I correct in saying that the WarehouseDB that you're trying to restore logs to was online and usable before you started? You set the DB to read only (ALTER DATABASE ... SET READ_ONLY...)?

If so, then to set that up as a log shipping secondary, you need to drop the DB, restore a new full backup either with STANDBY or NORECOVERY, then you can restore logs. If a DB was recovered and brought online you cannot then restore log backups to it.