Comment 2 for bug 562262

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Vincent Fretin (vincent-fretin) wrote :

This restriction was not introduced for security reason, but to simplify the implementation of the new pending shared template registry which fix the UserWarning of unassociated templates.

I don't remember precisely why we did that, and maybe it is now unnecessary for the latest implementation of the shared template registry that lives in a branch. I can't tell.

In the meantime, instead of grok.template on the view, you can use:
template = grok.PageTemplateFile("templates/errors/generic.pt")