Debug info: Argument 3 passed to global_navigation::load_activity() must be an instance of navigation_node, boolean given, called in [dirroot]/lib/navigationlib.php on line 1204 and defined
Error code: codingerror

Stack trace:

• line 406 of /lib/setuplib.php: coding_exception thrown
• line 2018 of /lib/navigationlib.php: call to default_error_handler()
• line 1204 of /lib/navigationlib.php: call to global_navigation->load_activity()
• line 2936 of /lib/navigationlib.php: call to global_navigation->initialise()
• line 766 of /lib/pagelib.php: call to navbar->has_items()
• line 28 of /theme/essential/layout/general.php: call to moodle_page->has_navbar()
• line 847 of /lib/outputrenderers.php: call to include()
• line 777 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
• line 720 of /lib/outputrenderers.php: call to core_renderer->header()
• line ? of unknownfile: call to core_renderer->redirect_message()
• line 1479 of /lib/setuplib.php: call to call_user_func_array()
• line 2540 of /lib/weblib.php: call to bootstrap_renderer->__call()
• line 2540 of /lib/weblib.php: call to bootstrap_renderer->redirect_message()
• line 3139 of /lib/moodlelib.php: call to redirect()
• line 3254 of /lib/moodlelib.php: call to require_login()
• line 48 of /mod/book/view.php: call to require_course_login()

Cheers,

Gareth