Xen users - Oct 2012 - blktap2 returning error even with kernel modue on ubuntu 12.04

Hi all,
        i am having some problem with making blktap2 to work on ubuntu
12.04 can you please help me on this.

Created PV guest ubuntu 12.04 64 bit on dom0 running Ubuntu 12.04 with
initial configuration
*[''file:/VM/vm-images/para-ubuntu.img,xvda,w''] * but
after installing and booting vm,changed to blktap2 after installing its
drivers on dom0 and made these changes to config file *tap2:tapdisk:aio:*
*
*
*Drivers*:
apt-get install blktap-dkms blktap-utils
*RESTARTED Dom0 after that.*

but vm is not starting after making these change.Its showing *(55808 blktap
kernel module not installed )*
*
*
*Kernel modules list:*
lsmod | grep xen
xen_gntdev             17676  0
xen_netback            27854  0 [permanent]
xen_blkback            23363  0 [permanent]
xen_evtchn             13172  3
xenfs                      18311  1
*
*
*xen version:*
*xen:4.1.2*

Where can be the problem? if the kernel is missing that module which
package should i install to fix it?
also i tried to change to *tap:aio: *In this case VM booted but inside vm i
am getting

*Gave up waiting for root device.  Common problems:*
* - Boot args (cat /proc/cmdline)*
*   - Check rootdelay= (did the system wait long enough?)*
*   - Check root= (did the system wait for the right device?)*
* - Missing modules (cat /proc/modules; ls /dev)*
*ALERT!  /dev/disk/by-uuid/52e5d884-2d59-437d-b890-313266995a42 does not
exist.  Dropping to a shell!*
*
*
*
*
*BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)*
*Enter ''help'' for a list of built-in commands.*
*
*
*(initramfs)*
*
*
It works ok if i use loop back by specifying* file:/*.Can any one please
help me in solving it.


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