Laravel - how to remove broadcasting stuff, pusher, etc

Before I wanted to use pusher for real time chat. Anyways now I dont use it, I upgraded my laravel version from 5.4 to 5.5 now I get strange error about pusher, and I just want to get rid of these. Just I dont know how.

Here is how it looks

https://ibb.co/kvbHAn

I tried to delete some files to check if it will help but no, at last I removed pusher dependency from my composer.json and updated. Still I dont know how to get rid of these. Any ideas?

via Chebli Mohamed