Hi Ian,

Unfortunately, yt_astro_analysis 1.0.0 is not compatible with yt 4.0 and later. You'll need to install the development version of yt_astro_analysis. There are instructions on that here:
https://yt-astro-analysis.readthedocs.io/en/latest/

Hopefully, we'll have a new release of yt-astro out soon!

Britton

On Fri, Oct 1, 2021 at 12:50 AM Ian Woodward <ianww@iinet.net.au> wrote:
BTW if I instead use:

    from yt.extensions.astro_analysis.halo_analysis import HaloCatalog

I get an error: Cannot find reference 'astro_analysis' in '__init__.py'
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