Xen-4.2 on CentOS 6.4 host can't boot

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http://www.linuxquestions.org – Hello, I've followed this tutorial to install Xen4CentOS on CentOS 6.4. When I boot the server with Xen, Grub gives this error: Code: invalid magic number: 9090 Error 13: Invalid or unsupported executable format The server supports EFI. To solve the problem, I've tried to copy "/boot/efi/EFI/redhat/grub.conf" to "/boot/grub/grub.conf" and run "grub-install sda", but it didn't work. My grub.conf is as below: Code: default=0 timeout=5 splashimage=(hd0,1)/grub/splash.xpm.gz hiddenmenu title CentOS (3.4.59-8.el6.centos.alt.x86_64)         (HowTos)