Comment (by Steven R. Brandt):

The main problem seems to be the ini parser in 3.12. It complains about things like this:

submitpattern   = 'Submitted batch job (\d+)'

The problem is that a \d is invalid inside a quoted string. To fix it, replace it with

submitpattern   = 'Submitted batch job (\\d+)'

or

submitpattern   = Submitted batch job (\d+)

Both seem to work.

There are also some problems with a few strings inside simfactory that need to be r-strings.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2760/syntaxwarnings-raised-during-build-process