"Collection /db/system/security/exist/accounts cannot be created."

I have an eXist-3 (yes, eXist-3) that won't respond and won't shutdown
(short of killing the process).  Starting it devolves into multiple
stack traces with the message in the subject.  Is there any hope for it?

I got here after killing eXist after a server backup filled the
filesystem and eXist became unresponsive.  (The backup was because a
Jenkins job running an Ant task had created some ghost collections that
showed only in the Java client and that the 'admin' user couldn't
delete, and I was going to tweak then reload the backup.)

Regards,


Tony Graham.
-- 
Senior Architect
XML Division
Antenna House, Inc.
----
Skerries, Ireland
[email protected]