Химия, гр.: ЖКХ-11, ДР-11, ОР-11, ХОР-11, ГД-21 (Янкович Я.Г.): Степень окисления

Navigation node add_before: Reference node not found participants, options: 13655 13680 home calendar

line 962 of \lib\navigationlib.php: call to debugging()
line 4097 of \lib\navigationlib.php: call to navigation_node_collection->add()
line 400 of \theme\moove\lib.php: call to flat_navigation->add()
line 282 of \theme\moove\lib.php: call to theme_moove_add_coursesections_to_navigation()
line 76 of \theme\moove\layout\incourse.php: call to theme_moove_extend_flat_navigation()
line 1379 of \lib\outputrenderers.php: call to include()
line 1309 of \lib\outputrenderers.php: call to core_renderer->render_page_layout()
line 321 of \mod\forum\discuss.php: call to core_renderer->header()