Livewire page component layout view not found: [components.layouts.app]

The error occurs when you trying to render a full page livewire component and you don't have  a file named app.blade.php in resources/views/layouts 

Assuming you have a livewire component called ShowPosts and you are trying to render  it as a full page via web.php

Route::get('/post', ShowPosts::class);

The file will look for the app.blade.php to where this livewire component will be embedded to. If you have created any, it will throw the error

Livewire page component layout view not found: [components.layouts.app]

Check the following documentation:

Livewire 2: https://laravel-livewire.com/docs/2.x/rendering-components#page-components

Livewire 3: https://livewire.laravel.com/docs/components#full-page-components

Create this file or if you are using livewire 3, you can easily generate this file with

php artisan livewire:layout