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.

Beginnen Sie damit, die Bereitstellung auf dem gemeldeten Windows Server 2012 R2 Hyper-V-Host zu reproduzieren und die angehängte s4bDeployment.txt zu prüfen. Untersuchen Sie anschließend Send-ALToastNotification.ps1 und AutomatedLabWorkerVirtualMachines.psm1 an den gemeldeten Speicherorten und konzentrieren Sie sich dabei auf die drei protokollierten Fehler. Als erledigt gilt die Aufgabe, wenn die Ursache der Bereitstellungsfehler identifiziert wurde und bestätigt ist, dass DC1 sein DVD-Laufwerk erfolgreich erhält.

Vom Indexierungsmodell aus dem Issue-Text verfasst.