Error when using contour with G'Gmic-Qt

With Fedora 43 KED Plasma, Gimp 3.0 and the plug-in G'Gmic-QT 3.6.5

filter : Contour   Extract Foreground (Interactive)

I got this error when I press on the OK button 

*** Error in ./fx_extract_foreground/*foreach/*substitute/x_segment/ *** Command 'x_segment': No display available.

Thanks for any help

Regards Yves