If you receive and error like this when using SteamCMD to update your servers try deleting the Steam directory in the root of your game server, the old hldsupdatetool is not compatible with SteamCMD!
app_update 740 validate
Steam> Initial App state (0x2) update required
App state (0x10102) reconfiguring, progress: -nan (0 / 0)
Error! App ‘740’ state is 0x1 after update job.