This error also occurs when using inkscape for file-export, even with -z:
$inkscape -z -f web-server.svg --export-plain-svg=plain-svg/web-server.svg
(inkscape:19819): Gdk-CRITICAL **: gdk_display_list_devices: assertion `GDK_IS_DISPLAY (display)' failed
Depending on the console width, this looks like "failed".
This error also occurs when using inkscape for file-export, even with -z:
$inkscape -z -f web-server.svg --export- plain-svg= plain-svg/ web-server. svg
(inkscape:19819): Gdk-CRITICAL **: gdk_display_ list_devices: assertion `GDK_IS_DISPLAY (display)' failed
Depending on the console width, this looks like "failed".