Xen users - Jul 2011 - Kernel panic after xen 4.0.1 being installed in RHEL5.4. Help

HI guys:
       While I ran xen 4.0.1  in RHEL5.4 , an kernel panic were found that
displayed as follow:
      PCI: Not using MMCONFIG.
       Red Hat nash version 5.1.19.6 starting
       IRQ handler type mismatch for IRQ 288
       cciss: Unable to get irq 288 for cciss0
        mount: could not find filesystem ''/dev/root''
       setuproot: moving /dev failed: No such file or directory
       setuproot: error mounting /proc: No such file or directory
       setuproot: error mounting /sys: No such file or directory
       switchroot: mount failed: No such file or directory
      Kernel panic - not syncing: Attempted to kill init !

         what are causes for this problem and how can i fix it ? urgently
need help.


Configuration details:
Grub:
       title Red Hat Enterprise Linux Server (2.6.18-194.el5xen)
        root (hd0,0)
        kernel /xen.gz-4.0.1 dom0_mem=1024M
        module /vmlinuz-2.6.18-194.el5xen ro root=LABEL=/ rhgb quiet
        module /initrd-2.6.18-194.el5xen.img
title Red Hat Enterprise Linux Server-base (2.6.18-194.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-194.el5 ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.18-194.el5.img

CPU: Xeon E5620


Thank you~


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