paths not found are not shown

[xoristzatziki]

UBUNTU 16.04, cinnamon 3.6.7, glade 3.18.3
trying to launch the glade file from https://github.com/welbornprod/glader an error is reported in GUI stating "the following paths are not found", but the paths are not shown.

Additionally, loading it from command line with: glade glader.glade
reports:
GladeUI-Message: 1 missing displayable value for GtkWidget::events
GladeUI-Message: 20 missing displayable value for GtkWidget::AtkObject::accessible-role
GladeUI-Message: 1 missing displayable value for GtkEntry::input-hints
GladeUI-Message: 1 missing displayable value for GtkButtonBox::layout-style
GladeUI-Message: 1 missing displayable value for GtkScrolledWindow::hscrollbar-policy
GladeUI-Message: 1 missing displayable value for GtkCellRendererAccel::accel-mode
GladeUI-Message: No displayable values for property GtkSourceView::background-pattern
GladeUI-Message: Glade needs artwork; a default icon will be used for the following classes:
 GtkApplicationWindow needs an icon named 'widget-gtk-applicationwindow'
 GtkSourceStyleSchemeChooserButton needs an icon named 'widget-gtksourceview-gtksourcestyleschemechooserbutton'
 GtkSourceView needs an icon named 'widget-gtksourceview-gtksourceview'
 GtkSourceMap needs an icon named 'widget-gtksourceview-gtksourcemap'
 GtkSourceStyleSchemeChooserWidget needs an icon named 'widget-gtksourceview-gtksourcestyleschemechooserwidget'

(glade:8509): GladeUI-CRITICAL **: glade_project_set_target_version: assertion 'catalog && catalog[0]' failed

(glade:8509): GladeUI-CRITICAL **: glade_project_get_target_version: assertion 'catalog && catalog[0]' failed

(glade:8509): Gtk-WARNING **: gtk_file_chooser_button_set_property: Choosers of type 'GtkFileChooserButton' do not support selecting multiple files.

(glade:8509): Gtk-WARNING **: gtk_file_chooser_button_set_property: Choosers of type 'GtkFileChooserButton' do not support selecting multiple files.

[xoristzatziki (simsonbike-bugs)]

Sorry for any inconvenience. Was a buggy glade file.
(contained an empty string as required library).