How to get rid of the warnnings and assertion failures in toolbar

[saml <saml 263 net>]

I have written a toolbar widget, compile has some problems. but when I running , 
there are many warnnings and assertion failures on console...
My source code is :
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 toolbar = gtk_toolbar_new (GTK_ORIENTATION_HORIZONTAL,GTK_TOOLBAR_TEXT);
 gtk_container_set_border_width (GTK_CONTAINER(toolbar), 5);
 gtk_toolbar_set_space_size(GTK_TOOLBAR(toolbar), 5);
 gtk_container_add(GTK_CONTAINER(box), toolbar);

 style = gtk_widget_get_style(window);

 icon = gdk_pixmap_create_from_xpm_d (window->window, &mask, &style->bg[GTK_STAT
E_NORMAL],(gchar **)computer_xpm);
 iconw = gtk_pixmap_new (icon, mask);

 item = gtk_toolbar_append_item (GTK_TOOLBAR(toolbar), "login", "login to server",
"login", iconw, GTK_SIGNAL_FUNC(login), 0);
 gtk_toolbar_append_space (GTK_TOOLBAR(toolbar));
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But the warnning in compiling are these:
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prefs_dialog/prefs_dialog.c:121: warning: passing arg 7 of `gtk_toolbar_append_i
tem' makes pointer from integer without a cast

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But the warnning in running are these:
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Gdk-WARNING **: Creating pixmap from xpm with NULL window and colormap

Gtk-CRITICAL **: file gtkbox.c: line 369 (gtk_box_pack_end): assertion `child->p
arent == NULL' failed.

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How can I get rid of them????????????