Failed to request certificate : Failed to lock file

SYSTEM INFORMATION
OS type and version Ubuntu Linux 20.04.4
Webmin version 1.984
Virtualmin version 6.17-3 Pro

Hi, while I am trying to request a certificate for new virtual server, I get this error:

Failed to request certificate : Failed to lock file /var/webmin/modules/virtual-server/letsencrypt-lock after 5 minutes. Last error was : Locked by PID 668021

Can you help me please what should I do?
Thank you.

SOLVED: after reboot

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