When first I run GRASS GIS 7.6.0, there is an error message :
```(gis_set.py:4772): Gtk-WARNING **: 16:05:43.648: Theme parsing error: gtk.css:2:33: Failed to import: Error opening file /home/mega/.config/gtk-3.0/whisker-tweak.css: No such file or directory``` I ignore the message. I start GRASS GIS. I import raster and vector. I add raster as RGB. Image is displayed in map display window. Then I choose Imagery > classify image > Interactive input for supervised classification. Then GRASS GIS supervised classification tool appear. But, no image in training area display and preview display. Then I import training area from vector map. Suddenly, all window GRASS GIS quit except GRASS GIS terminal window. So, how to solve this problem? I run in MX Linux 19. Thanks. Mega
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