title: gtk_icon_theme_get_for_screen error for nautilus
body: <p>Recently i have updated the ubuntu 14.04 to Ubuntu 15.04. Usually nautilus . command should open the directory in GUI.However, now i am getting the error like below. </p>
  
  <p>What is the recent for that and any solution to solve it</p>
  
  <pre><code>vanjikumaran@vanjikumaran-ThinkPad-T530:~$ nautilus .
  
  (nautilus:7627): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed
  
  (nautilus:7627): GLib-GObject-WARNING **: invalid (NULL) pointer instance
  
  (nautilus:7627): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
  vanjikumaran@vanjikumaran-ThinkPad-T530:~$
  </code></pre>