Errors on Python scripts

[Ferrero Horacio]

Could someone tell me from where can I find the lost thing on my
computer to have this error: xc_acm_op. What must I install to solve my
problem?

[horacio at localhost ~]$ /usr/sbin/xm
T[horacio at localhost ~]$ /usr/sbin/xm
Traceback (most recent call last):
  File "/usr/sbin/xm", line 8, in ?
    from xen.xm import main
  File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 43,
in ?
    from xen.util import security
  File "/usr/lib64/python2.4/site-packages/xen/util/security.py", line
24, in ?
    from xen.lowlevel import acm
ImportError: /usr/lib64/python2.4/site-packages/xen/lowlevel/acm.so:
undefined symbol: xc_acm_op
raceback (most recent call last):
  File "/usr/sbin/xm", line 8, in ?
    from xen.xm import main
  File "/usr/lib64/python2.4/site-packages/xen/xm/main.py", line 43,
in ?
    from xen.util import security
  File "/usr/lib64/python2.4/site-packages/xen/util/security.py", line
24, in ?
    from xen.lowlevel import acm
ImportError: /usr/lib64/python2.4/site-packages/xen/lowlevel/acm.so:
undefined symbol: xc_acm_op