CB and all our products are tested on PHP 7.1 for about 2-3 months now. We've fixed all PHP 7 related issues as they have been found. This assumes your install is completely up to date.
I have the same issue. Joomla said they will update to 4.0 and it does not work with PHP less then 7. So I changes to PHP 7 and I have same error with CB Reconfirm Email, line 134. I cannot get in my admin site also. My CB Reconfirm Email plagin is up to date, last update. Now, Kyle said no issue in line 134, I just rename plug_cbreconfirmemail to plug_cbreconfirmemail.bak. Now everything works fine. Is it correct way to fix?
You don't have an active subscription and can't download the latest releases. Your issue is simply that the plugin is out of date.