Automatic LetsEncrypt Provisioning Fails

I have been getting the dreaded “Too many certs…” error with the system trying to update certificates for about a week (my certs expire in 5 days). I re-updated mailinabox (was already using the latest version but ran the updater again to verify), which seemed to change the behavior of the interface. It now appears that the process is running, but it is not completing succesfully. I.e., the Provisioning works (giving the text shown below) but comes back with “Something went wrong, sorry” error when I click the “Finish” button after the time window has completed. Here’s the “log” shown in the admin browser interface: Any help here would be very much appreciated. Auto provisioning has always worked previously and I’d like to get this resolved before losing the certificates in a few days.

THanks

Log:
Reading account key from /home/user-data/ssl/lets_encrypt/account.pem.
Validating existing account saved to /home/user-data/ssl/lets_encrypt/registration.json.
Reusing existing challenges for amelia.frederickflightcenter.com.
The challenges for amelia.frederickflightcenter.com have been accepted.
Reusing existing challenges for mail.aperturegroup.co.
The challenges for mail.aperturegroup.co have been accepted.
Requesting new challenges for mail.frederickflightcenter.com.
Validation file is not present — a file must be installed on the web server.
Reusing existing challenges for mail.romeogolffox.com.
The challenges for mail.romeogolffox.com have been accepted.
Reusing existing challenges for mail.theaperturegroup.co.
The challenges for mail.theaperturegroup.co have been accepted.
Reading account key from /home/user-data/ssl/lets_encrypt/account.pem.
Validating existing account saved to /home/user-data/ssl/lets_encrypt/registration.json.
Reusing existing challenges for amelia.frederickflightcenter.com.
The challenges for amelia.frederickflightcenter.com have been accepted.
Reusing existing challenges for mail.aperturegroup.co.
The challenges for mail.aperturegroup.co have been accepted.
Reusing existing challenges for mail.frederickflightcenter.com.
Submitting challenge response file at http://mail.frederickflightcenter.com/.well-known/acme-challenge/9flWnYKy083gqu0D4jPtwkKqHtWJ8iPCQhO1PIegS_M.
Reusing existing challenges for mail.romeogolffox.com.
The challenges for mail.romeogolffox.com have been accepted.
Reusing existing challenges for mail.theaperturegroup.co.
The challenges for mail.theaperturegroup.co have been accepted.