When i write some command on terminal, this error message appear
FirstStrike@ubuntu:~$ gksu
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(gksu:6934): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
I have no idea about this, can anyone tell me if this a serious problem ?