SiteLock is server-side website security software. That means it is on the same system as your website and was probably set up by the same person who set up your website. Or maybe by your web host. So whoever is responsible for maintaining the software - you, your website tech person, or your web host - needs to adjust the SiteLock settings, reboot the software, or reboot the system. If, in fact it is a SiteLock problem, and, since the reported error is a SiteLock error, it is reasonable to assume that it is.
https://blog.tbwhs.com/is-sitelock-worth-it/
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