Windows Server Backup with Hyper-V

I'm trying to use Windows Server Backup on a Windows Server 2019 Standard with Hyper-V, but it gives me errors.

This is the message from Windows Server Backup:
"Backup succeeded but some components backed up were inconsistent in the snapshot. The application this component belongs to might not function properly after this backup is used for recovery."

And this is the message I get in Event Viewer for each VM that is online during the backup:
"VSS writers inside virtual machine '*****' failed to perform BackupComplete to its shadow copy (VSS snapshot) set: A function call was made when the object was in an incorrect state for that function (0x80042301)."