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.
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