[Lavavel] Laravel 5.2 could not open laravel.log

今天跑seed的時候發生laravel.log無法打開的錯誤。
找到StackFlow的解法如下：

http://stackoverflow.com/questions/35715400/laravel-5-2-could-not-open-laravel-log

Try the following commands on your shell:

1. Clear Laravel cache and the compiled classes
   php artisan cache:clear
   php artisan clear-compiled
2. Change the storage and cache directories permission
   sudo chmod -R 777 storage
   sudo chmod -R 777 bootstrap/cache
3. Regenerate the composer autoload file
   composer dump-autoload