On Thu, 14 Jan 2021, Cristián Arturo Ducoing Ruiz wrote:
 Hi, same problem here. (And same message) 
This is due to a recent change in the DB.NOMICS API. We already have a fix 
in our release candidate (due to become gretl 2021a next week). Could you 
please try to install the current snapshot ans see if this fixes the 
problem?
You can get the snapshot for Windows and OSX from
https://sourceforge.net/projects/gretl/files/snapshots/
Thanks for your help.
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   Riccardo (Jack) Lucchetti
   Dipartimento di Scienze Economiche e Sociali (DiSES)
   Università Politecnica delle Marche
   (formerly known as Università di Ancona)
   r.lucchetti(a)univpm.it
   
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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