Windows
Delete the folder %HOMEPATH%\.VirtualBox.
Then try again.
If it does not help, uninstall your current VirtualBox.
Re-install VirtualBox.
Install the VirtualBox recommended version.
Linux
VirtualBox is no longer the default hypervisor on Linux.
QEMU uses kvm and provides better compatibility and performance.
Delete the folder $HOME/.config/VirtualBox.
Then try again.
If it does not help, re-install the VirtualBox package from your distribution.
macOS (Intel x86_64 only)
VirtualBox is no longer the default hypervisor on macOS.
QEMU provides better compatibility and performance.
Also note that VirtualBox is not available for Mac M series.
Delete the folder $HOME/Library/VirtualBox.
Then try again.
If it does not help, re-install VirtualBox.