Fatal error: Uncaught Error: Call to a member function lesson_vocabulary() on null in /home/wwiwil/apps/iwill-laravel/storage/framework/views/5178035ea5fd306c1dd87d9df9895518c2f29f24.php:72 Stack trace: #0 {main} thrown in /home/wwiwil/apps/iwill-laravel/storage/framework/views/5178035ea5fd306c1dd87d9df9895518c2f29f24.php on line 72