Thanks for the info. This has been reported here 
https://github.com/Pylons/plaster/issues/25 and I've been trying to repro it. 
Something in the new release is not deduplicating things and just need to track 
that down and I'll get a fix out. :-) I have not yet had this happen in my envs 
but I think I have some ideas.

> On Nov 19, 2022, at 05:58, Lele Gaifax <[email protected]> wrote:
> 
> Hi,
> 
> I tried to update one of my applications to these latest versions, and I
> got some problem figuring out how to launch my app with pserve.
> 
> I have the "usual" dev.ini/prod.ini twin configuration files, and I'm
> used to launch the development app using
> 
>  pserve dev.ini
> 
> With latest version that command errors out with the following traceback
> 
>  Traceback (most recent call last):
>    File "/nix/store/.../bin/.pserve-wrapped", line 9, in <module>
>      sys.exit(main())
>    File 
> "/nix/store/.../lib/python3.10/site-packages/pyramid/scripts/pserve.py", line 
> 30, in main
>      return command.run()
>    File 
> "/nix/store/.../lib/python3.10/site-packages/pyramid/scripts/pserve.py", line 
> 189, in run
>      loader = self._get_config_loader(config_uri)
>    File 
> "/nix/store/.../lib/python3.10/site-packages/pyramid/scripts/common.py", line 
> 23, in get_config_loader
>      return plaster.get_loader(config_uri, protocols=['wsgi'])
>    File "/nix/store/.../lib/python3.10/site-packages/plaster/loaders.py", 
> line 115, in get_loader
>      raise MultipleLoadersFound(
>  plaster.exceptions.MultipleLoadersFound: Multiple plaster loaders were found 
> for scheme "file+ini", protocol "wsgi". Please specify a more specific 
> config_uri. Matched loaders: plaster-pastedeploy+file+ini, 
> plaster-pastedeploy+file+ini
> 
> After several attempts, I was able to launch the app using
> 
>  pserve plaster-pastedeploy+file+ini:dev.ini
> 
> Is that expected, or is there some problem with my configuration/usage?
> 
> Thanks in advance,
> bye, lele.
> -- 
> nickname: Lele Gaifax | Dire che Emacs è "conveniente" è come
> real: Emanuele Gaifas | etichettare l'ossigeno come "utile"
> [email protected]      |                           -- Rens Troost
> 
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