NetInstall services may be temporarily interrupted if you modify and save any NetBoot or NetInstall settings on the server. If you do this while installing clients over the network, the NetInstall process at the client will stop and display this error message:
There was an error during installation. Please try again.
To prevent this, simply refrain from modifying any settings in the Server Admin Utility Netboot Service plug-in while clients are being installed over the network.