NanoGong for Moodle 1.9 also needs some updating.
Navigation needs to be updated to use build_navigation()
* line 3759 of lib\weblib.php: call to debugging() * line 37 of theme\standard\header.html: call to print_navigation() * line 2765 of lib\weblib.php: call to include() * line 61 of mod\nanogong\view.php: call to print_header()