On 23 Sep 2017, at 02:14, Floris van Manen <vm@klankschap.nl> wrote:


On 23 Sep 2017, at 00:30, kaddour kardio <kaddourkardio@gmail.com> wrote:

you should  remove the line containing *simplefont*, you don’t
have to load it to get a proper import of fonts, besides the TeX Gyre super family is already available with the distribution, either standalone or the texlive distro




So the answer is that the command has changed:
http://wiki.contextgarden.net/simplefonts

However, the commands have slightly changed:
\setmainfont
is now 
\definefontfamily [myfamily] [serif] [DejaVu]
(and the same syntax to set the sans, mono and math font). 



That works, of course ;-)

.F