Debug info:
Error code: unknowncategory
Stack trace:
  • line 1730 of \lib\pagelib.php: moodle_exception thrown
  • line 1135 of \lib\pagelib.php: call to moodle_page->load_category()
  • line 34 of \course\index.php: call to moodle_page->set_category_by_id()