@Maticks, I got the same error
internal error: process exited while connecting to monitor: 2021-05-01T08:04:55.757538Z
qemu-system-x86_64: -blockdev
{"driver":"file","filename":"root","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}:
A regular file was expected by the 'file' driver, but something else was given
Did you solve this issue?