not enough variable arguments to fit a sentinel?

[Matí­as Alejandro Torres <torresmat gmail com>]

What about this warning????

181:dialog = gtk_file_chooser_dialog_new (_("Select where to save 
contacts."),
182:                                                                 NULL,
183:                                                                 
GTK_FILE_CHOOSER_ACTION_SAVE,
184:                                                                 NULL);


contacts.c:184: warning: not enough variable arguments to fit a sentinel

Note: I do not add the buttons here because it is done with 
gtk_file_chooser_add_button somewhere else.