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Hi there!
Do you get this error after logging into the staging site?
I can see it’s related to “WPBakery Page Builder” plugin, I suggest uninstalling this plugin via FTP (by deleting its folder), then you should be able to log into the staging site and try to reinstall it again.
If that doesn’t work, then please send us your site’s system information (from WP STAGING > System Info) via this form, and we will help you further from there.
Thanks,
Alaa