[libvirt] bug, libvirt, internal error

Hi, I'm having a problem with libvirt. Since a few days, when I try to create a virtual machine I get the following error and I could not solve it " Imposible completar la instalación: 'internal error: Cannot find suitable CPU model for given data' " ------------------------------------------------------------------------------------------------------------- Detalles: imposible completar la instalación: 'internal error: Cannot find suitable CPU model for given data' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 90, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 2277, in _do_async_install guest.start_install(meter=meter) File "/usr/share/virt-manager/virtinst/guest.py", line 501, in start_install noboot) File "/usr/share/virt-manager/virtinst/guest.py", line 416, in _create_guest dom = self.conn.createLinux(start_xml or final_xml, 0) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3606, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error: Cannot find suitable CPU model for given data ------------------------------------------------------------------------------------------------------------- I tried deleting the / var / cache / libvirt / qemu / capabilities / directory, and restarting libvirt but it did not work. I have other virtual machines on the physical server and they work fine, but I can not create new ones. How can i fix this Thank you