count(): Parameter must be an array or an object that implements Countable error after php artisan serve

[ishakteyran]

https://gist.github.com/ishakteyran/2528263d6b68f07068f2dcabcda6ca19

The above gist file is the trace of the bug.
I downloaded the code with composer and made every first-step successfully. Even the database seed and population of data is complete. and right after that i wanted to see the interface but when i php artisan serve and then look at the localhost:8000 this was what i got. Any suggestions?