Could not add DVD drive to machine DC1

I'm getting three errors during the deployment. Maybe one error has to do with the other.

This is the first error I get.

12:15:48|00:00:07|00:00:00.000| Lab 's4bhomeLab' hosted on 'HyperV' imported with 10 machines
Get-ItemPropertyValue : Property ServerNano does not exist at path HKEY_LOCAL_MACHINE\software\Microsoft\Windows NT\CurrentVersion\Server\ServerLevels.
At C:\Program Files\WindowsPowerShell\Modules\AutomatedLabNotifications\Private\Send-ALToastNotification.ps1:16 char:25
+ ... oreOrNano = Get-ItemPropertyValue 'HKLM:\software\Microsoft\Windows N ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Get-ItemPropertyValue], PSArgumentException
+ FullyQualifiedErrorId : Argument,Microsoft.PowerShell.Commands.GetItemPropertyValueCommand

This is the second error: I get this error 10 times, one for each host.

12:15:54|00:00:06|00:00:01.659| - The hosts file has been added 10 records. Clean them up using 'Remove-Lab' or manually if needed
12:15:54|00:00:06|00:00:00.000| - Creating HyperV machine 's4bfe01'..Set-VMFirmware : A parameter cannot be found that matches parameter name 'SecureBootTemplate'.
At C:\Program Files\WindowsPowerShell\Modules\AutomatedLabWorker\AutomatedLabWorkerVirtualMachines.psm1:296 char:52
+ ... vm | Set-VMFirmware -EnableSecureBoot Off -SecureBootTemplate Microso ...
--------------------------------------------------------------------------------------------------
This is the third error: It just sits there retrying to mount the iso file for the domain controler

12:24:50|00:09:02|00:00:00.000| Installing Certificate Servers
12:24:50|00:09:02|00:00:00.000| - Machines with Root CA role to be installed: 'DC1'
12:24:50|00:09:02|00:00:00.000| - Waiting for machines to start upCould not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retry
ing.
12:25:03|00:09:14|00:00:12.543| - Could not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retrying.
12:25:08|00:09:19|00:00:17.546| - Could not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retrying.
12:25:13|00:09:24|00:00:22.556| - Could not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retrying.
12:25:18|00:09:29|00:00:27.564| - Could not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retrying.
12:25:23|00:09:35|00:00:32.579| - Could not add DVD drive 'D:\LabSources\ISOs\en_windows_server_2012_r2_x64_dvd_2707946.iso' to machine 'DC1'. Retrying.

My host machine is windows 2012r2 with hyper-v
This is the output of the deployment process
[s4bDeployment.txt](https://github.com/AutomatedLab/SfBAutomatedLab/files/1589407/s4bDeployment.txt)

I have the feeling that I'm missing something very small, but I can't really figure it out yet after days now. I hope somebody knows what is going on.
Thank you in advance.

Commencez par reproduire le déploiement sur l’hôte Hyper-V Windows Server 2012 R2 signalé et examinez le fichier s4bDeployment.txt joint. Inspectez ensuite Send-ALToastNotification.ps1 et AutomatedLabWorkerVirtualMachines.psm1 aux emplacements signalés, en vous concentrant sur les trois échecs consignés. Le travail est terminé lorsque la cause des erreurs de déploiement est identifiée et qu’il est confirmé que DC1 reçoit correctement son lecteur DVD.

Rédigé par le modèle d'indexation à partir du texte de l'issue.