Microsoft-Windows-Hyper-V-VMMS/Admin, Event-ID 15268

Log Name	Microsoft-Windows-Hyper-V-VMMS/Admin
Source	Hyper-V-VMMS
Event-ID	15268
Level	Error
User	SYSTEM
Task Category	None
Message	Failed to get the disk information.

Check if an *.iso-File is mounted on a virtual dvd drive (with powershell)

Get-VM | Get-VMDvdDrive | ? DVDMediaType -eq "ISO" | select VMName, ControllerType, ControllerNumber, Path

If so, unmount them and check if the error persists.