VM will not start after upgrade from 7 to 8

Hi,

I have upgraded from pve 7 to pve 8. My vm will no longer start due to the following error. The vm is not using pci passthru.

kvm: -device pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e: Bus 'pci.0' not found
start failed: QEMU exited with code 1

Is there a work round for this issue. The vm was running fone before the upgrade.

Thanks,
-G