virError(Code=67, Domain=20): Unsupported Configuration with Device and OS/Boot Elements

This error message 'virError(Code=67, Domain=20, Message='unsupported configuration: per-device boot elements cannot be used together with os/boot elements')' indicates an incompatibility in your configuration. Code 67 signifies an unsupported configuration, while Domain 20 points to the conflict between device boot elements and OS/boot elements within the configuration.

To resolve this, you need to examine your configuration file and ensure that you are not using both device boot elements and OS/boot elements simultaneously. Choose one based on your requirements and remove or comment out the configuration lines for the other element. After making these changes, restart your program or service, and the error should be resolved.