You could try https://oxgarage-paderborn.tei-c.org which is build on the development version of OxGarage and fixes some known bugs.
If that fails as well I’d be curious to hear more details (here or at https://github.com/TEIC/oxgarage/issues)…
> Am 18.05.2018 um 19:13 schrieb Hugh Cayless <[log in to unmask]>:
> The TEI Stylesheets will do this kind of conversion—and indeed are the thing behind OxGarage. So if that's failing, it might point to a Stylesheets bug. If you can report the details of how it fails at https://github.com/TEIC/oxgarage/issues, we might be able to do something about it.
> On Fri, May 18, 2018 at 12:07 PM, Sylvain Féjoz <[log in to unmask]> wrote:
> I am looking for a tool converting TEI files to EPUB files.
> Does anyone have any experience in the choice of a tool among the ones available?
> Note: I tried http://www.tei-c.org/ege-webclient/ but I got an error message during the converting process.
> Thanks for your help.
> Sylvain Féjoz
> Bibliothèque de Genève