Unable to connect to VM 100 qmp socket

Please help.
My VM was stuck everytime I tried to boot with message "Boot to hard disk..."
I rebooted the host, and now, when I try to use the console, the journalctl shows the errors below.

Nov 15 20:46:24 pv1 qm[34334]: VM 100 qmp command failed - VM 100 qmp command 'set_password' failed - unable to connect to VM 100 qmp socket - timeout after 51 retries
Nov 15 20:46:24 pv1 pvedaemon[34332]: Failed to run vncproxy.

Nov 15 20:46:24 pv1 pvedaemon[4241]: <root@pam> end task...

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