Laravel Call to undefined method Illuminate\Database\Query\Builder::post_images()

I am trying this Query in Laravel 5.2

User::with(['posts'])
  ->withCount('post_images')
  ->orderBy('post_images_count', 'desc')
  ->take(8)
  ->get();

After that I got this error Call to undefined method Illuminate\Database\Query\Builder::post_images()

I did not understand what mistake is here.

Here users table has relation with posts Table and Posts table has relation with post_images table Please guide How can I fix this.

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