Fatal error: Uncaught Error: Attempt to assign property "assignment" on null in /home/pat/website/public/math/teaching/2012-fall-323/homework.inc:81
Stack trace:
#0 /home/pat/website/public/math/teaching/2012-fall-323/homework.php(10): include_once()
#1 {main}
thrown in /home/pat/website/public/math/teaching/2012-fall-323/homework.inc on line 81