[changeset b4b1131187c4 does not work under Ubuntu 16.04]

[Uwe Brauer]

   > On Fri, 25 Oct 2019 14:54:10 -0400, Uwe Brauer <oub at mat.ucm.es> wrote:

   > I vaguely remember seeing this about a year or a year and a half ago.
   > You probably have a very old extension somewhere.  If you don't get a  
   > traceback, you can add --traceback to the command, and it will
   > generally indicate where the problem is.

I did this here is the error:


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