Xen ERROR Couldn't find xen kernel for Ubuntu tree

xen-4.2 running on server with multiple CentOS running guest, But when i am trying to install Ubuntu i got following error.

How do i install Ubuntu on CentOS Xen Server?

[root@example ~]# virt-install -p -n ubuntu -r 2048 --vcpus=1 --disk=/home/OS/ubuntu,size=50 -l http://ift.tt/1zSO6ax --bridge=xenbr1

Starting install...
Retrieving file version.info...                                                                                                                              |  116 B     00:00 ...
ERROR    Couldn't find xen kernel for Ubuntu tree.



[root@example ~]# uname -r
3.10.43-11.el6.centos.alt.x86_64