title: Undefined class constant 'App\Providers\RouteServiceProvider::HOME'
body: <p>After upgrading the laravel 5.8 to laravel 6.x I am getting this error:</p>
  
  <pre><code>Undefined class constant 'App\Providers\RouteServiceProvider::HOME'
  </code></pre>
  
  <p>Before upgrading the application login system was the custom. After upgrading to laravel 6.x I want to use laravel default authentication. I created authentication through <code>php artisan ui:auth</code> and I copied controllers from fresh laravel <code>app/Http/Controllers/Auth</code> folder with auth related controllers like - <code>LoginController</code>, <code>RegisterController</code> etc.</p>
  
  <p>What should I do to solve the above error? Would someone help me, please?</p>