OS + Centos7.6 qemu-kvm

Unable to connect to libvirt qemu:///system.

internal error: Cannot find suitable emulator for x86_64

Libvirt URI is: qemu:///system

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/connection.py", line 1120, in _open_thread
    self._populate_initial_state()
  File "/usr/share/virt-manager/virtManager/connection.py", line 1074, in _populate_initial_state
    logging.debug("conn version=%s", self._backend.conn_version())
  File "/usr/share/virt-manager/virtinst/connection.py", line 325, in conn_version
    self._conn_version = self._libvirtconn.getVersion()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3991, in getVersion
    if ret == -1: raise libvirtError (‘virConnectGetVersion() failed‘, conn=self)
libvirtError: internal error: Cannot find suitable emulator for x86_64