On Mon, Jan 3, 2022 at 1:40 PM Ard Vilken <[email protected]> wrote:
>
> I didn't see anything about enabled plugins but the system information:
>
> Package        Version
> Trac         1.5.3
> Babel         2.9.1
> Jinja2
> pysqlite         2.6.0
> Python         3.10.0 (default, Oct 4 2021, 00:00:00) [GCC 11.2.1 20210728 
> (Red Hat 11.2.1-1)]
> pytz         2021.3
> setuptools         57.4.0
> SQLite         3.36.0
>
> Jinja2 had a blank entry.  Checked to see if jinja was installed and did this:
>
> [~]# sudo dnf install python3-jinja2
> Package python3-jinja2-3.0.1-2.fc35.noarch is already installed.
> Dependencies resolved.
> Nothing to do.
> ...
> AssertionError: Tried to resolve a name to a reference that was unknown to 
> the frame ('header')

That is a Jinja2 issue. See https://github.com/pallets/jinja/issues/1427.
Try to upgrade Jinja2 to 3.0.2+ or downgrade to 2.x.

In trunk of Trac, workaround for the issue has been applied.
Trac 1.5.4 has the changes, however is not still released.
See https://trac.edgewall.org/ticket/13404.

-- 
Jun Omae <[email protected]> (大前 潤)

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