Jails error (mkstemp failed) updating from 9.2.1 to 9.2.1.1

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I'm trying to use the GUI update from 9.2.1 (64-bit) to 9.2.1.1 and getting this error...

manage.py: [middleware.exceptions:38] [MiddlewareError: The firmware does not meet the pre-install criteria: mktemp: mkstemp failed on /mnt/huge/jail/owncloud_1/var/tmp/install_worker.gui_error_log.5BvsAAUG: No such file or directory mktemp: mkstemp failed on /mnt/huge/jail/owncloud_1/var/tmp/install_worker.verboselog.derBYiHa: No such file or directory mktemp: mkstemp failed on /mnt/huge/jail/owncloud_1/var/tmp/install_worker.usage_log.XEZ4xMyB: No such file or directory bin/install_worker.sh: cannot create : No such file or directory usage: rm [-f | -i] [-dIPRrvW] file ... unlink file ]

After installing 9.2.1 I installed the owncloud jail/plugin, but then removed it again. Is this perhaps related to https://bugs.freenas.org/issues/4169 ...?

Relevant files from zfs list are...

huge/jail 4.93G 3.18T 140M /mnt/huge/jail
huge/jail/.warden-template-9.1-RELEASE-amd64 393M 3.18T 393M /mnt/huge/jail/.warden-template-9.1-RELEASE-amd64
huge/jail/.warden-template-9.1-RELEASE-amd64-pluginjail 982M 3.18T 978M /mnt/huge/jail/.warden-template-9.1-RELEASE-amd64-pluginjail
huge/jail/.warden-template-pluginjail 1.25G 3.18T 1.25G /mnt/huge/jail/.warden-template-pluginjail
huge/jail/bit_1 285M 3.18T 1.23G /mnt/huge/jail/bit_1
huge/jail/dlna_1 565M 3.18T 1.50G /mnt/huge/jail/dlna_1
huge/jail/vegas 1.36G 3.18T 1.74G /mnt/huge/jail/vegas

Any advice please? Thanks in advance!

 

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Sorry, nevermind - rebooting before attempting an upgrade fixed it! Doh.

I'm still curious about all those various .warden-template directories, though - can any of them be safely removed?