[CentOS] cannot start virt-manager in centos 6

      I just upgrade from centos 5.6 to centos 6.0 on a x86_64 box. But 
when I try to create a new virtual guest, virt-manager give: Error: 
internal error cannot parse /usr/bin/qemu-system-x86_64 version number 
in 'QEMU emulator version 0.14.0, Copyright (c) 2003-2008 Fabrice Bellard'.
     I have googled it ,but got nothing help. Any help? Thanks first :-)