The WP site is up, and I can even log in as administrator, but any attempt to open the WP dashboard leads to a page including the above warning and error message.
I have downloaded the previous plugin version zip file. But now I don’t know how to install it if I can’t get to the WP dashboard. How can I do this?
(To attempt to protect my privacy, I replaced identifying information in the above messages with four dots – ….)
My guess was that there is a bug in the latest upgrade of the MailChimp for WP plugin, but I don’t know enough PHP to be able to find it or fix it.
Can anyone help?