gnome-terminal does not start

[andrey.rybak@bilkent.edu.tr]

hi all.
gnome-terminal does not start with next error:
"error constructing proxy for org.gnome.terminal..."

sequence of command
# locale-gen
# localectl set-locale LANG="en_US.UTF-8"
#reboot.
doesnot help

locale is en_US.UTF-8

Thanks