I cannot launch an instance.

get this in compute.log:

2014-05-15 17:02:09.225 4209 TRACE nova.compute.manager [instance: 31f99d54-1da0-4847-b8f0-d38fe1617ef9] libvirtError: Hook script execution failed: Hook script /etc/libvirt/hooks/qemu qemu failed with error code 256

Any help would be super!

thanks

adam