Error processing availability data for ‘1 January - 31 December’: Invalid availability text

• line 302 of /availability/classes/info.php: call to debugging()
• line 199 of /availability/classes/info.php: call to core_availability\info->warn_about_invalid_availability()
• line 2989 of /lib/modinfolib.php: call to core_availability\info->is_available()
• line 2109 of /lib/modinfolib.php: call to section_info->get_available()
• line 2135 of /lib/modinfolib.php: call to cm_info->obtain_dynamic_data()
• line 1413 of /lib/modinfolib.php: call to cm_info->get_user_visible()
• line 249 of /completion/classes/manager.php: call to cm_info->__get()
• line 284 of /completion/classes/manager.php: call to core_completion\manager::can_edit_bulk_completion()
• line 3912 of /course/lib.php: call to core_completion\manager::get_available_completion_tabs()
• line 4465 of /lib/navigationlib.php: call to course_get_user_administration_options()
• line 4195 of /lib/navigationlib.php: call to settings_navigation->load_course_settings()
• line 769 of /lib/pagelib.php: call to settings_navigation->initialise()
• line 830 of /lib/pagelib.php: call to moodle_page->magic_get_settingsnav()
• line 3573 of /lib/navigationlib.php: call to moodle_page->__get()
• line 4573 of /lib/outputrenderers.php: call to navbar->get_items()
• line 49 of /theme/emg_lms/layout/columns2.php: call to core_renderer->region_main_settings_menu()
• line 1400 of /lib/outputrenderers.php: call to include()
• line 1330 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
• line 1945 of /lib/setuplib.php: call to core_renderer->header()
• line 62 of /course/info.php: call to bootstrap_renderer->__call()