Cannot export IMAP folder to MBOX

Louis-Philippe Allard <[email protected]> Sun, 08 Sep 2019 11:30:56 -0400
Newsgroups gmane.comp.horde.user
Message-ID <20190908113056.Horde.JyOYq-44V9hwlR2wI9KxZHH@centos-mail>
Hello maillist

I am trying to export a GMAIL IMAP folder to an MBOX file.  I right  
click on the folder, and select "Export" then select "Download into a  
MBOX file".

The server works for a few minutes then Firefox throws a page saying

************************
File not found

An error occurred during a connection to hordemail.

    Check the file name for capitalization or other typing errors.
    Check to see if the file was moved, renamed or deleted.
************************

Horde.log has nothing relevant in it.

What is causing this?
  Louis-Philippe Allard
[email protected]
Sent using Horde Groupware on GNU/Linux
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