Those are not useful, since inkscape 0.92 as shipped in Debian uses gtk2, not 3.
Anyway, that means somehow your installation of libgtkmm-2.4-1v5 is broken, please try reinstalling it with
apt install --reinstall libgtkmm-2.4-1v5
and those 2 files I mentioned should pop up. Afterwards try to lunch inkscape again.
Those are not useful, since inkscape 0.92 as shipped in Debian uses gtk2, not 3.
Anyway, that means somehow your installation of libgtkmm-2.4-1v5 is broken, please try reinstalling it with
apt install --reinstall libgtkmm-2.4-1v5
and those 2 files I mentioned should pop up. Afterwards try to lunch inkscape again.