diff --git a/gramps/gui/dialog.py b/gramps/gui/dialog.py
index f510401bb..871718f7c 100644
--- a/gramps/gui/dialog.py
+++ b/gramps/gui/dialog.py
@@ -181,10 +181,10 @@ class ErrorDialog(Gtk.MessageDialog):
                                    flags=Gtk.DialogFlags.MODAL,
                                    type=Gtk.MessageType.ERROR,
                                    buttons=Gtk.ButtonsType.CLOSE)
-        self.set_markup('<span weight="bold" size="larger">%s</span>' % msg1)
+        self.set_markup('<span weight="bold" size="larger">%s</span>' % str(msg1))
         self.format_secondary_text(msg2)
         self.set_icon(ICON)
-        self.set_title("%s - Gramps" % msg1)
+        self.set_title("%s - Gramps" % str(msg1))
         self.show()
         self.run()
         self.destroy()
diff --git a/gramps/gui/grampsgui.py b/gramps/gui/grampsgui.py
index 4c75d3326..4df4ba9f7 100644
--- a/gramps/gui/grampsgui.py
+++ b/gramps/gui/grampsgui.py
@@ -287,12 +287,14 @@ def __startgramps(errors, argparser):
     from .dialog import ErrorDialog
     #handle first existing errors in GUI fashion
     if errors:
-        ErrorDialog(errors[0], errors[1])
+        for error in errors:
+            ErrorDialog(error[0], error[1])
         Gtk.main_quit()
         sys.exit(1)
 
     if argparser.errors:
-        ErrorDialog(argparser.errors[0], argparser.errors[1])
+        for error in argparser.errors:
+            ErrorDialog(argparser.error[0], argparser.error[1])
         Gtk.main_quit()
         sys.exit(1)