virsh failed to start vm

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virsh cannot start one of the vm with error like this

(process:88752): Spice-WARNING **: 08:13:22.028: reds.c:2652:reds_init_socket: binding socket to 0.0.0.0:6001 failed
2022-09-13T08:13:22.028198Z qemu-kvm: failed to initialize spice server
2022-09-13 08:13:22.118+0000: shutting down, reason=failed

this is the VM xml configuration

<channel type='spicevmc'>
  <target type='virtio' name='com.redhat.spice.0'/>
  <address type='virtio-serial' controller='0' bus='0' port='2'/>
</channel>

I'm running with RHEL7.6 and libvirt-4.5.0-23.el7_7.1.x86_64

Any clue?