EuGTK - GtkDrawingArea

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/usr/share/euphoria/include/std/sequence.e:1375 in function vslice() A machine-level exception occurred during execution of this statement
... called from ./eugtk_stuff/GtkEngine.e:188 in function lookup_object_class_from_handle()

... called from ./eugtk_stuff/GtkEngine.e:484 in procedure set()

... called from ./dmak_actions.e:22 in procedure setFoodColors()

This is line 22. 

set(drwColorBand1,"modify bg",0,"white")

drwColorBand1 is a GtkDrawingArea. 

drwColorBand1 = create(GtkDrawingArea)

This time I'm showing everything with
show_all(Win)

What is wrong with line 22?

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