Fedora xen - Aug 2007 - Upgrading to 2.6.20-1.2999 Fedora Core 6

After updating my system, the kernel change from 2.6.20-1.2962.fc6 to 
2.6.20-1.2999xen.fc6, and my original Xen installation now cannot have 
xend started, giving rise to the following errors instead.

Why and please help.      Thank you very much!!!!

Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit
Traceback (most recent call last):
  File "/usr/sbin/xend", line 49, in ?
    from xen.xend.server import SrvDaemon
  File
"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDaemon.py",
line 17, in ?
    import xen.lowlevel.xc
ImportError: /usr/lib/python2.4/site-packages/xen/lowlevel/xc.so: 
undefined symbol: xc_domain_set_memmap_limit