Make sure you add Providers in app.php and publish debugbar

Yes I have providers, facade.

...		'Illuminate\Html\HtmlServiceProvider',

		/*
		* Vendors Service Providers...
		*/
		'Barryvdh\Debugbar\ServiceProvider',
		'Kris\LaravelFormBuilder\FormBuilderServiceProvider',
		'Intervention\Image\ImageServiceProvider',
		'Zizaco\Entrust\EntrustServiceProvider',

		/*
		 * Application Service Providers...
		 */
		'App\Providers\AppServiceProvider',
...

problem is not only in debug bar but also not show any error. When I check config(app.debug) == true App::enviroment => local

What worked for me was changing the php.ini file: display_errors should be set to On...

I had this error and tried EVERYTHING - until I tried that last thing that worked. I had previously done

sudo chmod -R 755 storage

but was still getting a blank page with no errors in the laravel log and none in the server error log until i ran

sudo chmod -R 777 storage

SUCCESS

Thank you dylanglockler!